Issue340 reverseproxy config idempotency

[tombosmansibm]

This code improves idempotency for editing entries. It closes #340.

This is only applicable for the entries style of writing, where you can update multiple entries at once.
The code also does a more efficient check, by doing a single call per stanza instead of a call per entry (get_all instead of get).
That, however, does not make a noticable difference in performance.

That idempotency now works better, obvioulsy does make a huge difference in performance (when there are no changes), though.

These tests need to run twice, to demonstrate idempotency. If you run these with the current code, you'll see the idempotency check fails.

p(ibmsecurity.isam.web.reverse_proxy.configuration.entry.set(isamAppliance=isam_server,
                                                                                 reverseproxy_id="default",
                                                                                 stanza_id="filter-content-types",
                                                                                 entries=[["type", "text/html"],
                                                                                          ["type", "text/vnd.wap.wml"],
                                                                                          ["type",
                                                                                           "applications/atom+xml"]]))

    p(ibmsecurity.isam.web.reverse_proxy.configuration.entry.set(isamAppliance=isam_server,
                                                                                 reverseproxy_id="default",
                                                                                 stanza_id="server",
                                                                                 entries=[
                                                                                     ["use-http-only-cookies", "yes"],
                                                                                     ["allow-unsollicited-logins",
                                                                                      "no"],
                                                                                     ["worker-threads", "1000"],
                                                                                     ["suppress-server-identity", "yes"]
                                                                                     ]))

    p(ibmsecurity.isam.web.reverse_proxy.configuration.entry.set(isamAppliance=isam_server,
                                                                                 reverseproxy_id="default",
                                                                                 stanza_id="session",
                                                                                 entries=[
                                                                                     ["create-unauth-sessions", "yes"],
                                                                                     ["inactive-timeout", 1800],
                                                                                     ["max-entries", 8192],
                                                                                     ["ssl-id-sessions", "no"],
                                                                                     ["timeout", 21600],
                                                                                     ["unauth-inactive-timeout", 300],
                                                                                     ["unauth-max-entries", 4096]
                                                                                     ]))
    # Commit or Deploy the changes
    p(ibmsecurity.isam.appliance.commit(isamAppliance=isam_server))

I've also updated the readme to be in line with what is mentioned in the ibm.isam Ansible Collection.