Allow overriding max profile in debugable builds.

Support a system property on debugable builds to
override the max number of managed profiles to
allow easier dogfooding of multiple profiles.
Support 3 different badge colours for managed profiles.

Bug: 30473760
Test: runtest -c com.android.server.pm.UserManagerServiceCreateProfileTest frameworks-services
Test: runtest -c com.android.server.pm.UserManagerServiceUserInfoTest frameworks-services
Test: manual - attempting to create 2 profiles with adb fails, passes once I set the property.
Change-Id: Ie7fb19048a04a01572666f229283152254d0ffc3