hp_lefthand_rest_proxy no handler for logger during tests

Create the proxy during do_setup() instead of __init__()
so that the logger is ready for an import error during tests.

Closes-Bug: #1325116
Change-Id: I88145d97df5d746e92bc8302bf516ca9eaa05d00
Merge "hp_lefthand_rest_proxy no handler for logger during tests"