connCheckTimeout as flag

[henrod]

Which problem is this PR solving?

Adds a option to set connCheckTimeout. Now the value is hardcoded at 250ms.

Short description of the changes

Added a flag to accept a new timeout for connCheckTimeout (--discovery.conn-check-timeout) that receives a duration. Defaults to 250ms.

[codecov]

Codecov Report

Merging #911 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #911   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         126    126           
  Lines        6072   6079    +7     
=====================================
+ Hits         6072   6079    +7

Impacted Files	Coverage Δ
cmd/agent/app/builder.go	100% <ø> (ø)	⬆️
cmd/agent/app/reporter/tchannel/builder.go	100% <100%> (ø)	⬆️
cmd/agent/app/flags.go	100% <100%> (ø)	⬆️

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[black-adder]

thanks!