PushConnectionTest#limitCommandBytes: Increase maxCommandBytes

A higher limit is required to account for proper JGit version number
being sent in the UserAgent.

The version string "4.7.0.201704031717-r" is 20 characters, however
the strings used during development are shorter:

- When running from mvn, "4.7.0.qualifier" is used; 15 characters
- When running in Eclipse, "unknown" is used; 7 characters

Change-Id: I9aca2f71389a42fedce305e9078db016869c3d1a
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PushConnectionTest.java

@@ -184,7 +184,7 @@ public class PushConnectionTest {
 			updates.put(rru.getRemoteName(), rru);
 		}
 
-		server.getConfig().setInt("receive", null, "maxCommandBytes", 170);
+		server.getConfig().setInt("receive", null, "maxCommandBytes", 180);
 		try (Transport tn = testProtocol.open(uri, client, "server");
 				PushConnection connection = tn.openPush()) {
 			try {