Replace a hard-coded default remote's name with a constant

Change-Id: I4e369382b8a83a5c0772462d1b176b1e23910ada

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java

@@ -73,7 +73,7 @@
 @Command(common = true, usage = "Clone a repository into a new directory")
 class Clone extends AbstractFetchCommand {
 	@Option(name = "--origin", aliases = { "-o" }, metaVar = "name", usage = "use <name> instead of 'origin' to track upstream")
-	private String remoteName = "origin";
+	private String remoteName = Constants.DEFAULT_REMOTE_NAME;
 
 	@Argument(index = 0, required = true, metaVar = "uri-ish")
 	private String sourceUri;

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Fetch.java

 /*
  * Copyright (C) 2008-2009, Google Inc.
+ * Copyright (C) 2009, Mykola Nikishov <mn@mn.com.ua>
  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
  * and other copyright owners as documented in the project's IP log.
  *
@@ -48,6 +49,7 @@
 
 import org.kohsuke.args4j.Argument;
 import org.kohsuke.args4j.Option;
+import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.TextProgressMonitor;
 import org.eclipse.jgit.transport.FetchResult;
 import org.eclipse.jgit.transport.RefSpec;
@@ -81,7 +83,7 @@ void nothin(final boolean ignored) {
 	}
 
 	@Argument(index = 0, metaVar = "uri-ish")
-	private String remote = "origin";
+	private String remote = Constants.DEFAULT_REMOTE_NAME;
 
 	@Argument(index = 1, metaVar = "refspec")
 	private List<RefSpec> toget;

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Push.java

@@ -65,7 +65,7 @@ class Push extends TextBuiltin {
 	int timeout = -1;
 
 	@Argument(index = 0, metaVar = "uri-ish")
-	private String remote = "origin";
+	private String remote = Constants.DEFAULT_REMOTE_NAME;
 
 	@Argument(index = 1, metaVar = "refspec")
 	private final List<RefSpec> refSpecs = new ArrayList<RefSpec>();

org.eclipse.jgit/src/org/eclipse/jgit/lib/Constants.java

@@ -258,6 +258,9 @@ public final class Constants {
 	/** A gitignore file name */
 	public static final String GITIGNORE_FILENAME = ".gitignore";
 
+	/** Default remote name used by clone, push and fetch operations */
+	public static final String DEFAULT_REMOTE_NAME = "origin";
+
 	/**
 	 * Create a new digest function for objects.
 	 *