Several diverse improvements

[emmenlau]

This PR contains a number of small, self-contained improvements. The changes are:

• lib/cpp/src/thrift/transport/TBufferTransports.h: Minor whitespace changes

• TSocket.cpp: Print THRIFT_EAGAIN (timed out) to global error

• build/cmake/DefineOptions.cmake: Minor improvement in logging for 'WITH_MT'

• lib/cpp/test/CMakeLists.txt: Added missing boost::chrono

• build/cmake/BoostMacros.cmake: Removed 'Boost_NO_BOOST_CMAKE' and minor cleanup

• TCompactProtocol.tcc: add missing include cstdlib

• Include signal.h depending on HAVE_SIGNAL_H, not depending on linux

• Added new method isUnixDomainSocket() to check type of socket

• No Apache Jira ticket for trivial changes

• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?

• Changes are not squashed, to keep the consistency of each change

• Did you do your best to avoid breaking changes? If one was needed, did you label the Jira ticket with "Breaking-Change"?

• If your change does not involve any code, include [skip ci] anywhere in the commit message to free up build resources.

[Jens-G]

Any possibility that we can squash commits before merge again?

[emmenlau]

Any possibility that we can squash commits before merge again?

Yes! Sorry if the number of commits was excessive. My intention was to have relatively self-contained changes in each commit. And since the different commits add completely unrelated changes, I left them as individual commits. But I can squash next time if its preferred!

[Jens-G]

Well its not a strict law, you know, but sort of good practice. And if it really is thematically three things, then three commits it is. If its three larger topics then it should probably be also three individual PRs. Whatever makes sense.