Add config gerrit.primaryWeblinkName

Add gerrit.primaryWeblinkName to ServerInfo.
Lets the UI know which is the preferred weblink in instances were
only one weblink can be used, for example in inline links.

Change-Id: I01deaca3418d5c0486e3f5ebabf10827d47c3631

java/com/google/gerrit/extensions/common/GerritInfo.java

@@ -26,4 +26,5 @@ public class GerritInfo {
   public String reportBugUrl;
   public String reportBugText;
   public Set<UiType> webUis;
+  public String primaryWeblinkName;
 }

java/com/google/gerrit/server/restapi/config/GetServerInfo.java

@@ -313,6 +313,7 @@ public class GetServerInfo implements RestReadView<ConfigResource> {
     if (gerritOptions.enableGwtUi()) {
       info.webUis.add(UiType.GWT);
     }
+    info.primaryWeblinkName = config.getString("gerrit", null, "primaryWeblinkName");
     return info;
   }