veridex: Add cmd line flag to filter app classes by name

Veridex can now skip analyzing classes which do not match a provided
filter. The filter is passed to veridex using '--app-class-filter='
command line flag as a comma-separated list of class descriptor
prefixes, e.g. 'Landroid/net/,Landroid/utils/' matches all classes in
the '' and 'android.utils' packages and their subpackages.

Test: compiles, manually test against APKs
Change-Id: I4db9c3625399ee313a1ba0aba7f3d9073570cc70
6 files changed