CMLDEV-910 added raise for InitializationError when jwt is incorrect and usernam…#194

tmikuska merged 2 commits intodevCiscoDevNet/virl2-client:devfrom

CMLDEV-910-fixed-flow-with-invalid-jwt-on-initCiscoDevNet/virl2-client:CMLDEV-910-fixed-flow-with-invalid-jwt-on-initCopy head branch name to clipboard