Enable to run all integration test specs for Odo #417
Description
Current Odo integration tests are configured to run random test specs periodically to save time/resources. Running random specs in a periodic test run is acceptable, however, for performance measurement, it would be harder to get a test result matrix. It would be preferable to have a way to override the GINKGO flags to run all specs for performance tests.
From Odo Makefile,
GINKGO_FLAGS_ALL = $(GINKGO_TEST_ARGS) -randomizeAllSpecs -slowSpecThreshold=$(SLOW_SPEC_THRESHOLD) -timeout $(TIMEOUT)