GitLab

Update Travis CI to use Ubuntu Bionic in some cases

PiperOrigin-RevId: 313639562

Move Googletest OSS bazel builds to latest bazel.
The latest bazel ( 0.27.0 as of now ) does not run on trusty.

PiperOrigin-RevId: 253829774

Internal Change

PiperOrigin-RevId: 233614147

Comments changes, no functionality changes. 

Formatting changes,small cleanup,  no functionality changes

various changes to tests

merges-6

code merge

Implements a subset of TR1 tuple needed by gtest and gmock (by Zhanyong Wan); cleaned up the Python tests (by Vlad Losev); made run_tests.py invokable from any directory (by Vlad Losev).

Makes the Python tests more stable (by Vlad Losev); fixes a memory leak in GetThreadCount() on Mac (by Vlad Losev); improves fuse_gtest_files.py to support fusing Google Mock files (by Zhanyong Wan).

Makes the Python tests more portable by calling standard functions to interpret the result of os.system().  This could fix the broken Python tests on some users' machines.