Adding Logs and Reintroducing Tests to CTSShellSub

Adding new logs to ShellSubscriberTest to check total available
processors, total free memory, and to see if subprocess can print to
logcat. Reintroducing old shellsubscriber tests back.

Bug: 2247376
Test: ShellSubscriberTest
Change-Id: I1984e99bb01ec500e5960ed8b9744e0398f8fcd7
1 file changed