Making stc-set-openjdk11 non-destructive.

Change-Id: Icee7d34d3e00989e00a5b68a9d82dff7da1f6d96
diff --git a/tools/test/bin/stc-set-openjdk11 b/tools/test/bin/stc-set-openjdk11
index 47f70cf..490ad1c 100755
--- a/tools/test/bin/stc-set-openjdk11
+++ b/tools/test/bin/stc-set-openjdk11
@@ -9,6 +9,6 @@
     echo $node:
     ssh -n -o ConnectTimeout=3 -o PasswordAuthentication=no ${ONOS_USER}@$node "
         sudo update-java-alternatives -s java-1.11.0-openjdk-amd64
-        echo 'export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64' > .bash_aliases
+        echo 'export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64' >> .bash_aliases
     "
 done