Restore YAML submissions over XMLRPC
Restore YAML submissions over XMLRPC

Check for YAML for each type of exception
which json can raise.

Change-Id: Ie814a271a66f40b81ee3457962c77bd6ad044095

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server