Stop using deprecated oslo_concurrency and sql_connection config options

As per the logs:
 Option "lock_path" from group "DEFAULT" is deprecated. Use option "lock_path" from group
"oslo_concurrency".

Option "sql_connection" from group "DEFAULT" is deprecated. Use option
"connection" from group "database".

Change-Id: I2109cec07ebee916c9ce0ccd24bd9a47d8d3c688
diff --git a/lib/tempest b/lib/tempest
index f856ce0..7464499 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -275,7 +275,7 @@
 
     iniset $TEMPEST_CONFIG DEFAULT use_syslog $SYSLOG
     # Oslo
-    iniset $TEMPEST_CONFIG DEFAULT lock_path $TEMPEST_STATE_PATH
+    iniset $TEMPEST_CONFIG oslo_concurrency lock_path $TEMPEST_STATE_PATH
     mkdir -p $TEMPEST_STATE_PATH
     iniset $TEMPEST_CONFIG DEFAULT use_stderr False
     iniset $TEMPEST_CONFIG DEFAULT log_file tempest.log