Fix some test memory leaks, code convention, msvc warnings

Fix some test memory leaks, code convention, msvc warnings

Fix some test memory leaks, code convention, msvc warnings

Fix some test memory leaks, code convention, msvc warnings

Build pypa/manylinux2010 to replace debian9 build in nuget librdkafka…

….redist

Build pypa/manylinux2010 to replace debian9 build in nuget librdkafka…

….redist

Build on pypa/manylinux2010

Version bump to v1.6.0

fixup travis upg

Travis: --enable-static for arm64 build