Made AM package debug log more configurable.

* Added class ActivityManagerDebugConfig.java for housing all debug
log configuration for activity manager package.
* Added ability for using default activity manager log tag or class
specified tag string which is very helpful during debugging.
* Added ability to prepend log category name to log tag that can
also be useful during debugging.
* Converted BroadcastQueue.java and ActiveService.java to use the
new log class. Other classes in the package will be gradually
converted.

Change-Id: I0e4b343da75cb2e539b5ad5f0f79f6bc7af46d7b