wagon-scp should remove target area prior to uploading/unzipping new content

Similiar to the request captured in this issue (https://jira.codehaus.org/browse/MSITE-250), my problem is that our target area gets out of sync when we upload our site generated content frequently using CI. When files are moved/deleted, our site deployment target area becomes a hassle to keep correct because when noticed, we have to manually delete either old files, or the entire folder (because it's easier ) prior to deploying the site. I'd like it if the wagon-scp code could remove the files/subfolders in the target area prior to uploading.

I looked at the code, and a easy fix, which I tested, is to update the ScpHelper.putDirectory() method (in wagon-ssh-common) to remove the contents of the folder prior to uploading/unzipping the new files:

...
try
{
executor.executeCommand( "cd " + path + "; rm -rf * ");

wagon.put( zipFile, getPath( destDir, zipFile.getName() ) );

executor.executeCommand( "cd " + path + "; unzip -q -o " + zipFile.getName() + "; rm -f " + zipFile.getName() );

zipFile.delete();
...

I have attached the version of the file which I updated and tested, and below is what the output looks like with my simple test project.

Password for dev@localhost: XXXXXX
scp://localhost/tmp/site-deploy - Session: Opened
Executing command: mkdir -p /tmp/site-deploy/.
Executing command: cd /tmp/site-deploy/.; rm -rf *
Executing command: mkdir -p /tmp/site-deploy/.
Executing command: scp -t "/tmp/site-deploy/./wagon3163598898345372687.zip"
Uploading: ./wagon3163598898345372687.zip to scp://localhost/tmp/site-deploy