lava-server: except more exceptions
lava-server: except more exceptions

Change-Id: I87b5ea7de0b258649b5d87910eec050063172341
(cherry picked from commit cfd430353a17811d3e656d6d9637688c63fba804)

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