Bug 863445 - Part 1: Make mobile/android/base/Makefile.in generate fennec_ids.txt. r=jmaher

Building mobile/android/base will now generate
$(DEPTH)/mobile/android/base/fennec_ids.txt.

--HG--
rename : build/mobile/robocop/parse_ids.py => mobile/android/base/fennec-ids-generator.py
Bug 863445 - Part 2: Specify Robocop APK on runtestsremote.py command line. r=jmaher

This deprecates --robocop in favour of --robocop-ini, and
--robocopPath in favour of --robocop-apk.
Bug 863445 - Part 3: Make build/mobile/robocop/Makefile.in produce robocop-debug-signed.apk. r=jmaher

Also makes the developer-facing `make mochitest-robocop` run
robocop-debug-signed.apk, and deprecates `make
mochitest-robotium` (since we name this suite robocop on TBPL).