FileUtils: add method to get UUID of a volume

Change-Id: I41b76c5e01c82a2f8e67b33133a76947877a2814
Make contacts app aware of blacklist being disabled (1/3)

Change-Id: Ic59f370a6e78390c9b2b1510e0ec85b2f4af9146
Merge "Make contacts app aware of blacklist being disabled (1/3)" into cm-10.1
Merge "FileUtils: add method to get UUID of a volume" into cm-10.1
Merge branch 'cm-10.1' into martincz