Set SSH default port to 22

If nothing is configured, the advertised ssh address is *:29418, and it
is translated to host:29418.

If sshd.listenAddress is configured without a port, then the advertised
address is host:29418.

If it is configured with port 22, the advertised address is host, without
the port.

The logic in SshScheme assumed that "no port" is 29418, which is
incorrect.

Change-Id: I8b4717a1f5765272b4c3bd7683750ae8fd12a4d5

src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java
index ac198fb..03df236 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/download/scheme/SshScheme.java
@@ -53,7 +53,7 @@
       }
     }
 
-    int port = 29418;
+    int port = 22;
     String host = sshAddr;
     if (sshAddr != null) {
       int p = sshAddr.indexOf(":");