x86 KVM emulator job
We know have gitlab-ci runners that can provide nested KVM, which means that the x86 Android emulators can be run by gitlab-ci.
This also enables the Espresso UI tests that were written in !718 (merged). The ARM emulators were too slow to run them. The KVM x86 emulators can run them on android-25 and higher. Older Android versions timeout often, so the Espresso tests are not running there.