Test: ran rbesetup.sh and small build after.
Bug: b/166273085
Change-Id: I429835f1bb6da75e2fcee7e9ddac6b11672121cd
Merged-In: I429835f1bb6da75e2fcee7e9ddac6b11672121cd
Test: Ran "source build/envsetup.sh && source build/rbesetup.sh", then
ran "use_rbe m" and that worked.
Bug: b/150705712
Change-Id: I2d49fefbc1121f0d9c4e652396753b096e555a79
Merged-In: I2413a3648e9b2ff680cab6fededc07bbdd43378f