Add test cases for Clock

Add test_clock_add_alarm_multiple_times
Add clock test cases

test_clock_set_alarm_repeat;
test_clock_set_alarm_snooze;
test_clock_set_alarm_sound;
Address pep issues for #432

Address pep issues for #432.
test_clock_add_alarm_multiple_times.py
test_clock_set_alarm_repeat.py
test_clock_set_alarm_snooze.py
test_clock_set_alarm_sound.py
Re-implement tap on value selectors for #432

Address issues for #432.
test_clock_add_alarm_multiple_times.py
test_clock_set_alarm_repeat.py
test_clock_set_alarm_snooze.py
test_clock_set_alarm_sound.py
Move local parameters to class for #432 and add test case for #440

Move local parameters to class for #432 and add test case for #440
test_clock_set_alarm_repeat.py
test_clock_set_alarm_snooze.py
test_clock_set_alarm_sound.py
test_clock_set_alarm_time.py
Remove Tab for #432

only test_clock_set_alarm_sound.py is modified
Add more verification steps for #432

Add manifest.ini
Add more verification steps
Remove unlock screen
remove extra lines #432

removed extra lines and move time.sleep(1) to function
changes for #432

add alarm_close" to clock_object and use it in set alarm repeat;
Modify the verification for adding multiple alarms;
Fixes for #432

Modify tapping on lable to edit to tapping on item to edit.
Add clear all alarms before adding alarm multiple times so we can verify
the alarm count is correct.
Merge pull request #432 from angelc04/master

Add new gaia ui test cases for clock