Removed CVXPY logger warning (#465)
Removed CVXPY logger warning (#465)

Having a warning that pops up when qutip is loaded should probably be
avoided.  Here the call to the diamond norm already tells the user that
the module is missing.
cgranade/qutip,anubhavvardhan/qutip,qutip/qutip,qutip/qutip,anubhavvardhan/qutip,cgranade/qutip