Format all sources with Uncrustify

Formatted all sources and manually tuned some files to make the code look
neater.

maxscale-system-test/mxs827_write_timeout.cpp

@@ -1,6 +1,6 @@
 /**
  * @file mxs827_write_timeout "ReadWriteSplit only keeps used connection alive, query crashes after unused
- *connection times out"
+ * connection times out"
  * - SET wait_timeout=20
  * - do only SELECT during 30 seconds
  * - try INSERT