Added new android.test.base targets

Renames ...-legacy-test-... targets related to stubs generation to
...-android-test-base-....

(cherry picked from commit 5c99382a)

Bug: 30188076
Test: make checkbuild
Change-Id: I40b39c5250b7d990a903052c0b1ebd694242b5b3
Merged-Id: I54204733612d6d3f14dd8023973e993a5ddab51d