Drop grant specific code

The way it is now won't provide any benefit, so let's just drop it.
Let's see how we can resolve this issue in the installer...

Thanks for review + comments, Andrew

From: Michael Prokop <mprokop@sipwise.com>

ngcp-update-db-schema

@@ -35,11 +35,6 @@ if [ -z "${SIPWISE_DB_PASSWORD}" ] ; then
   exit 1
 fi
 
-if ! mysql -usipwise -p"${SIPWISE_DB_PASSWORD}" -e "GRANT ALL PRIVILEGES ON *.* TO sipwise@localhost IDENTIFIED BY '${SIPWISE_DB_PASSWORD}' WITH GRANT OPTION;" ; then
-  echo 'Error: grants for user sipwise on localhost could not be applied.' >&2
-  exit 1
-fi
-
 # support automated installation
 if [ -n "$AUTOMATED_INSTALL_MODE" ] ; then
   echo "Running in automated installation mode, ignoring check for empty db_schema."