More FrozenString fixes

Author: DavidS

tasks/sql.rb

@@ -8,10 +8,10 @@
 def get(sql, database, user, port, password, host)
   env_hash = { 'PGPASSWORD' => password } unless password.nil?
   cmd_string = "psql -c \"#{sql}\""
-  cmd_string << " --dbname=#{database}" unless database.nil?
-  cmd_string << " --username=#{user}" unless user.nil?
-  cmd_string << " --port=#{port}" unless port.nil?
-  cmd_string << " --host=#{host}" unless host.nil?
+  cmd_string += " --dbname=#{database}" unless database.nil?
+  cmd_string += " --username=#{user}" unless user.nil?
+  cmd_string += " --port=#{port}" unless port.nil?
+  cmd_string += " --host=#{host}" unless host.nil?
   stdout, stderr, status = Open3.capture3(env_hash, cmd_string)
   raise Puppet::Error, stderr if status != 0
   { status: stdout.strip }