new: [postres] support user with dots in their name

postgres/lib/common

@@ -81,13 +81,13 @@ db_has_user() {
 db_create_user() {
     local user="$1" password="$2"
     ## Using this instead of pipes is important so that trap works
-    ddb < <(echo "CREATE USER $user WITH PASSWORD '$password' CREATEDB NOCREATEROLE;")
+    ddb < <(echo "CREATE USER \"$user\" WITH PASSWORD '$password' CREATEDB NOCREATEROLE;")
 }
 
 db_change_password() {
     local user="$1" password="$2"
     ## Using this instead of pipes is important so that trap works
-    ddb < <(echo "ALTER USER $user WITH PASSWORD '$password';")
+    ddb < <(echo "ALTER USER \"$user\" WITH PASSWORD '$password';")
 }