[20121] Remove unnecessary TCP warning & Fix some tests (backport #4217)

[mergify]

This is an automatic backport of pull request #4217 done by Mergify.
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	both modified:   src/cpp/rtps/transport/TCPTransportInterface.cpp

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[JesusPoderoso]

@richiprosima please test linux please test mac

[Mario-DL]

@richiprosima please test linux test mac

[Mario-DL]

@jepemi same also here
Thanks !

[Mario-DL]

I am going ahead and take advantage of this PR to include a couple of commits that fix some of the failing tests of the 2.6.x branch.

[Mario-DL]

@richiprosima please test linux test discovery_server

[Mario-DL]

Failing tests on Windows v141 are not related and different tests fail in different runs. Thread sanitizer has no deadlocks but is stuck in the post setup ccache step and it reports fail due to that.
Marking the PR as ready to merge

[Mario-DL]

LGTM