MXS-1220: Simplify test creation

The tests now automatically start MaxScale before each test block and stop
it and perform cleanup after the test. This is done by simply calling the
`before.sh` and `after.sh` scripts before each test block.

server/core/test/rest-api/after.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+#
+# This script is run after each test block. It kills the MaxScale process
+# and cleans up the directories that contain generated files.
+#
+
+test -z "$MAXSCALE_DIR" && exit 1
+
+maxscaledir=$MAXSCALE_DIR
+
+pid=`cat $maxscaledir/maxscale.pid`
+echo $pid
+
+for ((i=0;i<60;i++))
+do
+    kill -0 $pid
+
+    if [ $? -eq 0 ]
+    then
+        # Process is still up
+        kill $pid
+
+        if [ $i -gt 3 ]
+        then
+            sleep 0.1
+        fi
+    else
+        break
+    fi
+done
+
+rm -r $maxscaledir/lib/maxscale
+rm -r $maxscaledir/cache/maxscale
+rm -r $maxscaledir/run/maxscale
+mkdir -m 0755 -p $maxscaledir/lib/maxscale
+mkdir -m 0755 -p $maxscaledir/cache/maxscale
+mkdir -m 0755 -p $maxscaledir/run/maxscale