VOL-426 This commit solves the problems caused when the voltha user
already exists on the install target. The installer now checks and
re-uses the user if it's already there.

Change-Id: Ie81989a09a66981db6a462799d7d2e9422acd147
diff --git a/install/BashLogin.sh b/install/BashLogin.sh
index 9f85351..7b355e5 100644
--- a/install/BashLogin.sh
+++ b/install/BashLogin.sh
@@ -4,6 +4,7 @@
 echo "vinstall ALL=(ALL) NOPASSWD:ALL" > tmp
 sudo chown root.root tmp
 sudo mv tmp /etc/sudoers.d/vinstall
+sudo chmod 664 /etc/sudoers.d/vinstall
 mkdir .ssh
 chmod 0700 .ssh
 ssh-keygen -f /home/vinstall/.ssh/id_rsa -t rsa -N ''