Merge from Widevine repo of http://go/wvgerrit/56521
This CL adds a common main routine for integration tests. It sets a
default test configuration for the provisioning and license server
urls and certificates, and allows the user to set them on the command
line.
Test: current unit tests still pass.
Bug: 72354901 Fix Generic Crypto tests.
Change-Id: I604a3d9e15d50da5041794624c4571c0dcb091f5
