Support mime types with wildcard as subtype in formatter config

This allows to register a formatter for all files that match a certain
media type, e.g.:

  [formatter "PLAIN_TEXT"]
    mimeType = text/*

Change-Id: I5dacf1270501e0608fe115cb924448ef3df76782
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/Formatters.java b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/Formatters.java
index a1e3e84..0d6a77e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/Formatters.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/xdocs/formatter/Formatters.java
@@ -102,9 +102,11 @@
             continue;
           }
         }
-        for (String configuredMimeType :
-          formatterCfg.getStringList(KEY_MIME_TYPE)) {
-          if (mimeType.equals(new MimeType(configuredMimeType))) {
+        for (String mt : formatterCfg.getStringList(KEY_MIME_TYPE)) {
+          MimeType configuredMimeType = new MimeType(mt);
+          if (mimeType.equals(configuredMimeType)
+              || ("*".equals(configuredMimeType.getSubType())
+                  && mimeType.getMediaType().equals(configuredMimeType.getMediaType()))) {
             int prio = formatterCfg.getInt(KEY_PRIO, 0);
             if (formatter == null || prio > formatterPrio) {
               formatter = new FormatterProvider(e.getKey(), e.getValue());