Update JGit version used to detect API changes to 4.7.0.201704051617-r

We detect API changes during the Maven build using japicmp. Update the
reference version to the latest minor version 4.7.0.201704051617-r.

Change-Id: Iab354fbf745cdfe44f71ce0bb64bb838b8bcd57d

pom.xml

@@ -191,7 +191,7 @@
     <maven.build.timestamp.format>yyyyMMddHHmm</maven.build.timestamp.format>
     <bundle-manifest>${project.build.directory}/META-INF/MANIFEST.MF</bundle-manifest>
 
-    <jgit-last-release-version>4.6.0.201612231935-r</jgit-last-release-version>
+    <jgit-last-release-version>4.7.0.201704051617-r</jgit-last-release-version>
     <jsch-version>0.1.54</jsch-version>
     <javaewah-version>1.1.6</javaewah-version>
     <junit-version>4.12</junit-version>