This CL is adding the apex_defaults modules to provide common parameters for the releases corresponding to Q, R, S and T. These defaults servers as a common place to add properties which should affect all mainline modules. Bug: 172589606 Test: USE_RBE=true m Since there are no runtime changes, successful code build is enough for testing. Change-Id: Ib7aeff510712b047df44bc1d16570c5a48d24e11