connector: accept base64 encoded CA and add convience open method
connector: accept base64 encoded CA and add convience open method

cjyar/dex,ericchiang/dex,chub/coreos-dex,coreos/dex,holgerkoser/dex,cjyar/dex,holgerkoser/dex,circleci/dex,rithujohn191/dex,Calpicow/dex,circleci/dex,holgerkoser/dex,chub/coreos-dex,coreos/dex,wolfeidau/dex,xeonx/dex,ericchiang/dex,ericchiang/dex,xeonx/dex,jwmaag/dex,xeonx/dex,rithujohn191/dex,circleci/dex,jwmaag/dex,Calpicow/dex,Calpicow/dex,coreos/dex,wolfeidau/dex,rithujohn191/dex,jwmaag/dex,wolfeidau/dex,cjyar/dex,chub/coreos-dex