Reapply "Add a queue system server-side for NetworkAgent"

Now that faulty Telephony tests have been disabled temporarily
to allow for this bugfix, this can be reverted.
This reverts commit a5ec9b41128ad926475116b184d71b34740fd6f1.

Test: FrameworksTelephonyTests CtsNetTestCases
Change-Id: I71abf9d02bdd34a4de80157a3f42bdfee6f6617e
5 files changed