The default configuration of the mFi controller generates self-signed
certificates which are valid for short periods of time, and which are
regnerated on start or as needed. This makes requests mad. Since most
people will be using the self-signed certificates anyway, add options
to let them choose non-TLS, or unverified connections if they want/need.
This bumps the mficlient requirement to 0.3.0 for proper handling of
verify=False.
The exception we were catching incorrectly referenced the client variable
in local scope instead of the module. Also, if we fail to connect we can
get a requests exception, so catch and handle that as well.