Bump ibrowse to 4.4.1

[wohali]

Overview

Continuation of #437 .

Desired to improve ipv6 support, amongst other fixes. This should make @dch happy.

Testing recommendations

make check

[jiangphcn]

Looks Jenkins is not happy and I just restarted to run make check.

[nickva]

Running tests locally I get:

module 'couch_replicator_attachments_too_large'
  couch_replicator_attachments_too_large:32: attachment_too_large_replication_test_ (t_should_succeed)...Unknown message recvd for "127.0.0.1":55036 -> {'EXIT',<0.1574.0>,normal}
Recvd unknown message {'EXIT',<0.1574.0>,normal} when in state: {state,
                                                                 "127.0.0.1",
                                                                 55036,
                                                                 infinity,
                                                                 #Ref<0.1159142428.3944218626.132623>,
                                                                 false,
                                                                 undefined,[],
                                                                 false,
                                                                 #Port<0.23>,
                                                                 false,[],
                                                                 {[{request,
                                                                    {url,
                                                                     "http://127.0.0.1:55036/eunit-test-db-9442d3be026365816935a64f69ce56d3/doc?new_edits=false",
                                                                     "127.0.0.1",
                                                                     55036,
                                                                     undefined,
                                                                     undefined,
                                                                     "/eunit-test-db-9442d3be026365816935a64f69ce56d3/doc?new_edits=false",
                                                                     http,
                                                                     ipv4_address},
                                                                    put,
                                                                    [{response_format,
                                                                      binary},
                                                                     {inactivity_timeout,
                                                                      30000},
                                                                     {socket_options,
                                                                      [{nodelay,
                                                                        false},
                                                                       {keepalive,
                                                                        true}]}],
                                                                    {<0.1573.0>,
                                                                     #Ref<0.1159142428.3944218625.127559>},
                                                                    undefined,
                                                                    false,
                                                                    [{nodelay,
                                                                      false},
                                                                     {keepalive,
                                                                      true}],
                                                                    -576460752303421502,
                                                                    false,
                                                                    1048576,
                                                                    false,
                                                                    undefined,
                                                                    undefined,
                                                                    false,
                                                                    binary,
                                                                    undefined,
                                                                    <<"PUT /eunit-test-db-9442d3be026365816935a64f69ce56d3/doc?new_edits=false HTTP/1.1\r\nUser-Agent: CouchDB-Replicator/3.0.0-d5038ac\r\nContent-Type: multipart/related; boundary=\"adc59da26ba0aa919162725b7b1af78d\"\r\nContent-Length: 1503\r\nAccept: application/json\r\nCookie: AuthSession=cmVwX2V1bml0X2FkbWluOjYwOTJGQzQwOh8MOR0YfNKzSKMnYeXb-BBfNx2P\r\nHost: 127.0.0.1:55036\r\n\r\n--adc59da26ba0aa919162725b7b1af78d\r\nContent-Type: application/json\r\n\r\n{\"_id\":\"doc\",\"_rev\":\"1-435cee941931b1c9833c6ce1214babc2\",\"_revisions\":{\"start\":1,\"ids\":[\"435cee941931b1c9833c6ce1214babc2\"]},\"_attachments\":{\"att\":{\"content_type\":\"app/binary\",\"revpos

This is related to the issue submitted by @rnewson to upstream ibrowse project: cmullaparthi/ibrowse#146

[nickva]

It looks like we call ibrowse:spawn_link_worker_process(Url) and since ibrowse had started to trap exists we can't rely on our replication workers just exiting and having the ibrowse workers they are linked to cleaned up automatically.

[nickva]

Based on what ibrowse author had mentioned terminate/2 should be called. But that happens only if the parent [1] process dies not any linked process. In our (CouchDB) case, we simply link to worker when we check it out from the pool so this link is not a "parent" link so that means terminate/2 won't be called and the ibrowse worker won't stop.

[1] A parent in OTP terminology is indicated by a pdict entry. And the code to call terminate/2 only when receiving 'EXIT' from parents is https://github.com/erlang/otp/blob/master/lib/stdlib/src/gen_server.erl#L480-L481

[nickva]

The fix was merged upstream cmullaparthi/ibrowse@232f83c

We'll need to set that option in our replicator

[wohali]

@closing in favour of #3551 and @nickva if possible backport to 3.x appreciated, thank you!