First cut of the print notifications.

    1. Added notifications for a queued print job, for a started print job,
       for ongoing canceling a print job, and for a failed print job. The
       notifications for queued and started state have a cancel action. The
       notification for failed print job has a cancel and a restart action.

    2. Propagating failure message from the print service to the notifications.

    3. PrintJobConfigActivity was not setting the initial value for the
       print job copies and was not updating the UI immediately after creation.

    4. Refactored PrintJobConfigActivity to avoid using the hack to avoid
       reaction for item selection change in a spinner for an event that
       happened before the callback was registered.

    5. Removed the label attribute from PrinterInfo and now PrinterId is
       composed of the printer name and the service component name. This
       is nice since for restarting print jobs we do not need to store
       information about the printer except the printer id which is
       already part of the PrintJobInfo's data. Also the printer name
       is not expected to change anyway.

    6. Allowing cancellation of a queued print job. Also no print job is
       cancelled without asking the managing print service to do that.
       Before we were immediately canceling print jobs in queued state
       but it was possible for a buggy print service to not set the
       print job state to started before starting to do expensive work
       that will not be canceled.

    7. PrintServiceInfo was throwing an exception the the meta-data
       XML for the print service was not well-formed which would crash
       the system process. Now we just ignore not well-formed meta-data.

    8. Removed unused permissions from the PrintSpooler's manifest.

Change-Id: Iba2dd14b487f56e137b90d1da17c3033422ab5e6