Add ipv6 address supporting for file transfer using scp

Some files's scp does not have supporting for ipv6 address.
So, I have added supporting for ipv6 address using scp.

Change-Id: Ie6db5c6988c708e4cec862f6b671dd64b457a69a
diff --git a/tools/dev/bin/cell-build b/tools/dev/bin/cell-build
index 3136c72..e1ba127 100755
--- a/tools/dev/bin/cell-build
+++ b/tools/dev/bin/cell-build
@@ -33,7 +33,7 @@
 git diff $baseCommit > /tmp/$baseCommit.patch
 
 # Copy patch file to the remote build machine
-scp /tmp/$baseCommit.patch $ONOS_USER@$OCN:/tmp
+scp /tmp/$baseCommit.patch $ONOS_USER@[$OCN]:/tmp
 
 ssh -t -t $ONOS_USER@$OCN "
     source ~/.bash_aliases