minor data source edit form improvement

docker/blocks/prometheus/fig

@@ -3,8 +3,6 @@ prometheus:
   net: host
   ports:
     - "9090:9090"
-  volumes:
-    - /var/docker/prometheus:/prometheus-data
 
 node_exporter:
   image: prom/node-exporter

public/app/features/plugins/partials/ds_edit.html

@@ -28,9 +28,9 @@
     <form name="ctrl.editForm" ng-if="ctrl.current">
       <div class="gf-form-group">
         <div class="gf-form-inline">
-					<div class="gf-form">
+					<div class="gf-form max-width-30">
 						<span class="gf-form-label width-7">Name</span>
-						<input class="gf-form-input max-width-21" type="text" ng-model="ctrl.current.name" placeholder="My data source name" required>
+						<input class="gf-form-input max-width-23" type="text" ng-model="ctrl.current.name" placeholder="name" required>
 						<info-popover offset="0px -135px" mode="right-absolute">
 							The name is used when you select the data source in panels.
 							The <em>Default</em> data source is preselected in new