fix login behind proxy (#6898)
fix login behind proxy (#6898)

we're using rest_client 1.6.9, which doesn't use proxy passed in
to the RestClient::Request.execute.  Must set RestClient.proxy
instead

PatrickLang/vagrant,crashlytics/vagrant,kamazee/vagrant,sax/vagrant,aneeshusa/vagrant,mwrock/vagrant,bryson/vagrant,benizi/vagrant,TheBigBear/vagrant,crashlytics/vagrant,mwrock/vagrant,aneeshusa/vagrant,PatrickLang/vagrant,PatOShea/vagrant,PatOShea/vagrant,bryson/vagrant,kamigerami/vagrant,tomfanning/vagrant,mwrock/vagrant,vamegh/vagrant,TheBigBear/vagrant,benizi/vagrant,bdwyertech/vagrant,bryson/vagrant,marxarelli/vagrant,taliesins/vagrant,mitchellh/vagrant,petems/vagrant,kamigerami/vagrant,krig/vagrant,jtopper/vagrant,justincampbell/vagrant,kamazee/vagrant,benh57/vagrant,signed8bit/vagrant,marxarelli/vagrant,lonniev/vagrant,kamigerami/vagrant,benh57/vagrant,sni/vagrant,PatrickLang/vagrant,lukebakken/vagrant,PatOShea/vagrant,tomfanning/vagrant,Chhed13/vagrant,signed8bit/vagrant,carlosefr/vagrant,mitchellh/vagrant,bdwyertech/vagrant,PatOShea/vagrant,sni/vagrant,signed8bit/vagrant,gitebra/vagrant,petems/vagrant,crashlytics/vagrant,petems/vagrant,krig/vagrant,bshurts/vagrant,tomfanning/vagrant,jtopper/vagrant,lukebakken/vagrant,bdwyertech/vagrant,chrisroberts/vagrant,sax/vagrant,justincampbell/vagrant,lonniev/vagrant,marxarelli/vagrant,bdwyertech/vagrant,taliesins/vagrant,marxarelli/vagrant,lonniev/vagrant,sni/vagrant,carlosefr/vagrant,TheBigBear/vagrant,sax/vagrant,justincampbell/vagrant,gitebra/vagrant,chrisroberts/vagrant,kamazee/vagrant,sni/vagrant,tomfanning/vagrant,mwrock/vagrant,justincampbell/vagrant,bshurts/vagrant,signed8bit/vagrant,mitchellh/vagrant,jtopper/vagrant,taliesins/vagrant,kamigerami/vagrant,vamegh/vagrant,petems/vagrant,Chhed13/vagrant,sax/vagrant,carlosefr/vagrant,PatrickLang/vagrant,mitchellh/vagrant,TheBigBear/vagrant,Chhed13/vagrant,benh57/vagrant,bshurts/vagrant,jtopper/vagrant,benizi/vagrant,aneeshusa/vagrant,vamegh/vagrant,chrisroberts/vagrant,lonniev/vagrant,carlosefr/vagrant,crashlytics/vagrant,chrisroberts/vagrant,gitebra/vagrant,benizi/vagrant,lukebakken/vagrant,krig/vagrant,bshurts/vagrant,krig/vagrant,kamazee/vagrant,gitebra/vagrant,bryson/vagrant,Chhed13/vagrant,aneeshusa/vagrant,taliesins/vagrant,vamegh/vagrant,lukebakken/vagrant,benh57/vagrant