Symlink directories are ignored in subdirectories of `forward_common_files` in SSHContext

[LavendaRaphael]

Local directory tree like this

.
├── testdir
│ └── testlink-> ../../testsubdir

If I set forward_common_files=['testdir'], then in the remote directory, there will be no testdir and its subdirectories.
I think the problem is

dpdispatcher/dpdispatcher/ssh_context.py

Line 313 in 9438565

for root, dirs, files in os.walk(file_name, topdown=False):

This might fix it:

         for root, dirs, files in os.walk(file_name, topdown=False, followlinks=True) :

[njzjz]

Could you submit a pull request?