Support SOURCE_TYPE in VoicemailContract.Status

Visual voicemail protocol type is written to the SOURCE_TYPE field upon
activation. For example, "vvm_type_omtp". This string will help the 
dialer interpret protocol-specific error codes.

Helper methods in VoicemailContract.Status is removed in ag/1074791.
This CL replaces VoicemailUtils with VoicemailStatus to support the
removed functionality. It is also changed to an editor to update
multiple values with a single query.

Bug:26944391
Change-Id: Id5fae6852e7f15f6d9ddcdbde6577e379f16a5f3
9 files changed