Support to enable/disable the Jira integration in the UI

On the ProjectInfoScreen there is now a dropdown list for the
plugin.its-jira.enabled parameter which offers the values true,
false, enforced and INHERIT. Project owners can change this parameter
and save it. If the Jira integration is enforced by a parent project
the dropdown list is disabled.

Change-Id: I440b0fcee112bf4d0dea9339e6080c1fcd9a23b7
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraModule.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraModule.java b/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraModule.java
index 8448ac3..5677556 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraModule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/hooks/jira/JiraModule.java
@@ -20,6 +20,7 @@
 
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.gerrit.server.config.PluginConfigFactory;
 import com.google.inject.AbstractModule;
 import com.google.inject.Inject;
 
@@ -32,12 +33,14 @@
 
   private final String pluginName;
   private final Config gerritConfig;
+  private final PluginConfigFactory pluginCfgFactory;
 
   @Inject
-  public JiraModule(@PluginName final String pluginName,
-      @GerritServerConfig final Config config) {
+  public JiraModule(@PluginName String pluginName,
+      @GerritServerConfig Config config, PluginConfigFactory pluginCfgFactory) {
     this.pluginName = pluginName;
     this.gerritConfig = config;
+    this.pluginCfgFactory = pluginCfgFactory;
   }
 
   @Override
@@ -46,7 +49,7 @@
       LOG.info("JIRA is configured as ITS");
       bind(ItsFacade.class).toInstance(new JiraItsFacade(pluginName, gerritConfig));
 
-      install(new ItsHookModule());
+      install(new ItsHookModule(pluginName, pluginCfgFactory));
     }
   }
 }

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 55087e9..c11aec4 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -29,6 +29,12 @@
 a project can enforce the Jira integration for all child projects by
 setting `plugin.its-jira.enabled` to `enforced`.
 
+On the project info screen there is a dropdown list for the
+`plugin.its-jira.enabled` parameter which offers the values `true`,
+`false`, `enforced` and `INHERIT`. Project owners can change this
+parameter and save it. If the Jira integration is enforced by a parent
+project the dropdown list is disabled.
+
 The Jira integration can be limited to specific branches by setting
 `plugin.its-jira.branch`. The branches may be configured using explicit
 branch names, ref patterns, or regular expressions. Multiple branches