Make branch path look up more specific

If we have the following branch path:
m/master/default.xml
m/master123/default.xml

With previous implementation, when the default.xml manifest in master
branch is updated both of the above monitor will be removed. This fix
will only remove the first entry.

This does not fix the following case:
m/release/1.2/default.xml
m/release/1.2/3/default.xml

Change-Id: Ibfbfb1ca12a14d42c71073fa3cb61c47aaea86d6

src/main/java/com/amd/gerrit/plugins/manifestsubscription/ManifestSubscription.java

diff --git a/src/main/java/com/amd/gerrit/plugins/manifestsubscription/ManifestSubscription.java b/src/main/java/com/amd/gerrit/plugins/manifestsubscription/ManifestSubscription.java
index 49d78fd..08c6a24 100644
--- a/src/main/java/com/amd/gerrit/plugins/manifestsubscription/ManifestSubscription.java
+++ b/src/main/java/com/amd/gerrit/plugins/manifestsubscription/ManifestSubscription.java
@@ -260,7 +260,7 @@
             String branchPath;
             while (iter.hasNext()) {
               branchPath = iter.next();
-              if (branchPath.startsWith(branchName)) {
+              if (branchPath.startsWith(branchName+"/")) {
                 iter.remove();
                 manifestStores.remove(store, branchPath);
                 manifestSource.remove(store, branchPath);