Change docker login user

Switch user to docker, because Anonymous user is not supported after nexus3 upgrade.

Issue-ID: INT-1493
Signed-off-by: Zebek Bogumil <bogumil.zebek@nokia.com>
Change-Id: If455ebcee5e6880a33bca8a2ca189fc5e9539927
diff --git a/run-csit.sh b/run-csit.sh
index 5551d21..2c45812 100755
--- a/run-csit.sh
+++ b/run-csit.sh
@@ -139,7 +139,7 @@
 export ROBOT_VARIABLES=
 
 # Sign in to nexus3 docker repo
-docker login -u anonymous -p anonymous nexus3.onap.org:10001
+docker login -u docker -p docker nexus3.onap.org:10001
 
 # Run setup script plan if it exists
 cd "${TESTPLANDIR}"