Fix UnicodeEncodeError in xmlrpc api due to non-english characters.
Fix UnicodeEncodeError in xmlrpc api due to non-english characters.

Change-Id: Ib592222b46d0a9cc2d953f3da3e32c417d665e92

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