Fix: Unterminated quoted string when creating read user

puppetdb in default config will create a read-only user, however there
is a bug[1] with the syntax to set the default read grant.

Fix it with help from comments[2].

[1] puppetlabs#330 (comment)
[2] puppetlabs#339 (comment)

Co-authored-by: Romain Tartière <romain@blogreen.org>
Signed-off-by: Jake Yip <jake.yip@ardc.edu.au>

Author: waipeng

manifests/database/default_read_grant.pp

@@ -19,7 +19,7 @@
                   acl.defaclacl
                 FROM pg_default_acl acl
                 JOIN pg_namespace ns ON acl.defaclnamespace=ns.oid
-                WHERE acl.defaclacl::text ~ '.*\\\\\"${database_read_only_username}\\\\\"=r/${database_username}\\\".*'
+                WHERE '@' || array_to_string(acl.defaclacl, '@') || '@' ~ '@(\"?)${database_read_only_username}\\1=r/(\"?)${database_username}\\2@'
                 AND nspname = '${schema}'",
   }
 
@@ -36,7 +36,7 @@
                   acl.defaclacl
                 FROM pg_default_acl acl
                 JOIN pg_namespace ns ON acl.defaclnamespace=ns.oid
-                WHERE acl.defaclacl::text ~ '.*\\\\\"${database_read_only_username}\\\\\"=U/${database_username}\\\".*'
+                WHERE '@' || array_to_string(acl.defaclacl, '@') || '@' ~ '@(\"?)${database_read_only_username}\\1=U/(\"?)${database_username}\\2@'
                 AND nspname = '${schema}'",
   }
 
@@ -53,7 +53,7 @@
                   acl.defaclacl
                 FROM pg_default_acl acl
                 JOIN pg_namespace ns ON acl.defaclnamespace=ns.oid
-                WHERE acl.defaclacl::text ~ '.*\\\\\"${database_read_only_username}\\\\\"=X/${database_username}\\\".*'
+                WHERE '@' || array_to_string(acl.defaclacl, '@') || '@' ~ '@(\"?)${database_read_only_username}\\1=X/(\"?)${database_username}\\2@'
                 AND nspname = '${schema}'",
   }
 }