Binding on-demand #10: Remove permanent binding and add registration

This CL is the last of the P1 CLs for binding on-demand. During
transport-usage migration to binding on-demand the permanent-bound
code was still there and we piggybacked on it to register the
transports. Now that everything is migrated we removed the permanent
binding and used the registration code created in the CL #9
(selectTransport) for registering all the transports.

I put a 3s delay on registration after bring-up. Any operation that uses
the transport before that will gracefully fail.

The TransportBoundListener does not return a boolean anymore because it
can't fail anymore (we pass it the data it needs so that it doesn't need
to be exposed to TransportNotRegistered exceptions). It's now called
OnTransportRegisteredListener.

Eligible transports were a similar thing to valid transports from the
permanent binding code, whose only need came from rebinding from what I
could tell. I saw no need for it anymore and removed it. If I missed
something please shout :)

I shuffled methods a bit in TransportManager.

There were a lot of changes to robo test infra to bring together
TransportManager tests and the rest and re-use mocking infra.

Change-Id: If61268228dd0bb724b718abd3dcafdad50e8b3dc
Ref: http://go/br-binding-on-demand
Bug: 17140907
Test: m -j RunFrameworksServicesRoboTest
Test: runtest -p com.android.server.backup frameworks-services
Test: gts-tradefed run commandAndExit gts-dev -m GtsBackupTestCases
Test: gts-tradefed run commandAndExit gts-dev -m GtsBackupHostTestCases
Test: cts-tradefed run commandAndExit cts-dev -m CtsBackupTestCases
Test: adb shell bmgr enable true/false
Test: adb shell bmgr list transports [-c]
Test: adb shell bmgr transport <transport_name>/-c <transport_component>
Test: adb shell bmgr restore <token>/<token> <package>/<package>
Test: adb shell bmgr backup <pacakge>
Test: adb shell bmgr run
Test: adb shell bmgr wipe <transport> <package>
Test: adb shell bmgr fullbackup <package>
Test: adb shell bmgr backupnow --all/<packages>
Test: adb shell cmd jobscheduler run -f android <job_id>
Test: adb shell dumpsys backup
Test: D2D scenario