Add --skip-connection-check parameter

[cdrage]

Adds --skip-connection-check parameter to ignore oc checking for
logged in status / cluster is online.

[cdrage]

Unblocks #488 @kadel

[cdrage]

I'm honestly not too sure why this is failing. I'm going to troubleshoot a few things.

[surajnarwade]

LGTM, worked for me,

$ odo app list --skip-connection-check -v
DEBU[0000] getOcBinary - searching for oc binary        
DEBU[0000] envKubectlPluginCaller = 
                   
DEBU[0000] envOcBin = 
                                 
DEBU[0000] using oc from PATH                           
DEBU[0000] using oc from %s/home/snarwade/go/bin/oc     
ACTIVE   NAME
         app1
  *      app2
DEBU[0000] Could not get the latest release information in time. Never mind, exiting gracefully :)