Switch Travis from Xenial to Bionic with Mongo 4.0 #4873
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MongoDB 3.4 is not available on Bionic and 4.0 is already installed.
Mongo 4.0 significantly changes the test runtimes. 2x was too much of a jump, so this is approximately 60s more than the last successful run time. That comes out to (test time used to calculate in parentheses): 24% increase for "Unit Tests (Python 2.7 MongoDB 4.0)" (812s) 37% increase for "Integration Tests (Python 2.7)" (903s) 95% increase for "Lint Checks, Packs Tests (Python 2.7)" (490s) 71% increase for "Unit Tests, Pack Tests (Python 3.6)" (1101s) 252% increase for "Integration Tests (Python 3.6)" (1031s) Note that this PR also fixes the Python 3.6 integration tests to actually run in python 3.6 instead of 2.7, so that might account for some of the significant test time increase. When we move to python 3.7 that will probably decrease the py3 times.
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This is a rebased version of #4862. It is here for future reference (to show how minimal the update is) when we want to consider moving to bionic. I will immediately close it.
Switches travis to use Bionic with Mongo 4.0
Mongo 3.4 is not available in Bionic, so 4.0 is required.
Also, the test thresholds were increased to account for increased test times due to the mongo update.