wsk should remove trailing slash on apihost

[twavv]

Just spent an embarrassing amount of time trying to determine why the wsk CLI was working on one machine and not on another. The ultimate issue was that I ended up specifying the APIHOST variable as https://localhost:8443/ in the config file, with the trailing slash, which causes 404s since the CLI was sending requests to https://localhost:8443//api/v1/namespaces/_/triggers?limit=0&skip=0 (note the double-slash after the domain).

[rabbah]

Sorry about that @travigd. Agree this should get fixed. (Contributions welcomed :)