remove tests

[headupinclouds]

Migrated: elucideye/drishti#255

All gauze tests are left on the phone.

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for android we can rm -rf /data/local/tmp/drishtisdk before starting all tests
rm -rf /data/local/tmp/drishtisdk after running

Implementation notes: cleanup fixture before all tests started and after tests finished.

I've noticed that the ios-deploy device tests seem to end up installing each test-drishti- application twice

Install will be run for each drishti_add_test directive even if we are running same application, e.g.:

add_executable(foo ...)
drishti_add_test(NAME FooTest1 COMMAND foo --arg1)
drishti_add_test(NAME FooTest2 COMMAND foo --arg2)

will install foo twice: one for FooTest1 and another for FooTest2. This can be fixed by using install fixture.