Properly escape project name when querying the config URL
Properly escape project name when querying the config URL

Projects with names like 'plugins/emoticons' were causing the
project url to be /projects/plugins/emoticons/config instead of
/projects/plugins%2Femoticons/config, causing a 404.

Change-Id: Ib646f145716b299b06e02ea7277a3759c4b71356

WANdisco/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,joshuawilson/merrit,MerritCR/merrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,WANdisco/gerrit,MerritCR/merrit,gerrit-review/gerrit,gerrit-review/gerrit,MerritCR/merrit,WANdisco/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,joshuawilson/merrit,joshuawilson/merrit,gerrit-review/gerrit,joshuawilson/merrit,joshuawilson/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,joshuawilson/merrit,MerritCR/merrit,joshuawilson/merrit,MerritCR/merrit,gerrit-review/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,gerrit-review/gerrit