Fix NPE for tasks without a subId

UploadTask does not have a valid subId because it is broadcasted
toward all accounts. ACTION_SYNC_VOICEMAIL is also toward all accounts
and lacks the subId.
In ag/1245021 we passed in a voicemail status editor with the invalid
subId while creating the upload task, which causes NPE.

After this CL OmtpVvmSyncService.sync() no longer accepts a null subId.
Events that targets all accounts will launch a individual task for each
account instead.

- TaskId.SUB_ID_ANY is removed. All task should have a explicit subId

Change-Id: Ib4892daf4f9cb732dbce9710f87754cd780fa535
Fixes: 30367830
7 files changed