test: Tests to increase coverage
test: Tests to increase coverage

ClientInitFailFindConfig
ClientInitFailReadConfig
ClientInitFailReadDevId
ClientInitFailWriteDevId
ClientInitMissingAppId
ClientInitOverlengthAppId
ConfigMissingHost
ConfigMissingPort
ConfigMissingToken
HandlerInitMissingKey
HandlerInitWebsockets

Signed-off-by: Ben Astell <ded3fae2663d1648fc922f7692e7914ea175e4a7@windriver.com>

rcwoolley/device-cloud-python,rcwoolley/device-cloud-python