Make run_tests.sh verbose and enable unit tests

Make run_tests.sh verbose and enable unit tests

By default output from run_tests is verbose. This enables seeing the
error messages in Jenkins' console output when a job fails.

Output can alternatively be captured to a log file using an -f flag.
Example invocation for logging output to a file: $ ./run_tests.sh -f

Running of unittest from run_test.sh is enabled.

JIRA: YARDSTICK-102
      YARDSTICK-104

Change-Id: I3be7d7873cf75247980d97c3fbdf0bfdbabe53ad
Signed-off-by: Kristian Hunt <kristian.hunt@gmail.com>