Added support for the infrastructure for on demand access/create the

server connection.

The BaseDriver and BaseConnection are two abstract classes, which allows
us to replace the existing driver with the currently used. The current
implementation supports to connect the PostgreSQL and Postgres Plus
Advanced Server using the psycopg2 driver.

web/pgadmin/static/css/overrides.css

@@ -416,16 +416,6 @@ iframe {
     -o-text-overow: ellipsis;
 }
 
-.icon-server-connected {
-    background-image: url('/browser/server/static/img/server.png') !important;
-    border-radius: 10px
-}
-
-.icon-server-not-connected {
-    background-image: url('/browser/server/static/img/serverbad.png') !important;
-    border-radius: 10px
-}
-
 .form-control {
     color: #333333;
 }
@@ -435,3 +425,26 @@ iframe {
 fieldset[disabled] .form-control {
     color: #666666;
 }
+
+.highlight {
+    padding: 5px;
+    margin-bottom: 5px;
+    background-color: #F7F7F9;
+    border: 1px solid #E1E1E8;
+    border-radius: 3px;
+}
+
+.highlight.has-error {
+    border-color: #A94442;
+}
+
+.icon-fa::before {
+    font: normal normal normal 14px/1 FontAwesome;
+    text-rendering: auto;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    transform: translate(0, 0);
+    display: inline-block;
+    margin-left: -18px;
+    margin-right: 9px;
+}