Adjust python-testing-utils install command

Add robotframework-onap subdirectory to checkout the right branch
previousely we automatically checked out the default branch which can
change by external things and would also be wrong for past releases

Change-Id: I1e8d2dac6aee04a58494d84bd038340b21f0dd04
Issue-ID: TEST-143
Signed-off-by: DR695H <dr695h@att.com>
diff --git a/run-csit.sh b/run-csit.sh
index b729c64..93f4b7e 100755
--- a/run-csit.sh
+++ b/run-csit.sh
@@ -98,6 +98,7 @@
 mkdir -p ${ROBOT_VENV}/src/onap
 rm -rf ${ROBOT_VENV}/src/onap/testsuite
 git clone https://gerrit.onap.org/r/testsuite/python-testing-utils.git ${ROBOT_VENV}/src/onap/testsuite/python-testing-utils
+git -C ${ROBOT_VENV}/src/onap/testsuite/python-testing-utils checkout master
 pip install --upgrade ${ROBOT_VENV}/src/onap/testsuite/python-testing-utils/robotframework-onap
 
 pip freeze