Show owner info creation if no owner is set for UserTile

Forward port from cm-10.2.
Squash of the following commits:

Show owner info creation if no owner is set for UserTile

Fix showing owner info creation from UserTile if no owner is set

* Turns out the default user will always be present, meaning a check of
  user count == 0 fails.

Show default profile name if no profile exists

UserTile : Check if profile has a photo

In the event that the profile doesn't have a photo, don't default to the
user's photo, instead show a default avatar.

Change-Id: I89de06f8578280e4671526418b2cabcc5f4348c7

Conflicts:
	packages/SystemUI/src/com/android/systemui/quicksettings/UserTile.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/quicksettings/UserTile.java