Make Signaller HTTP-client more configurable #100
Merged
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This commit introduces additional options for tweaking Signaller HTTP-client:
http.Transport fields if they are different from the default value of
a corresponding command-line argument, but with the possibility to set
them to 0, because 0 is a valid value for them;
Also, this commit adds draining of a response body from Signaler's
upstream for improving connection reuse.