Description of problem:
Using the command "rmlist" will fail if list_data_dir is not a child of var_prefix. The default settings satisfy this requirement, but a user who sets a custom value for list_data_dir in their mm_cfg.py will likely run into this problem.


Version-Release number of selected component (if applicable):
Mailman 2.1.12-18.el6


How reproducible: Deterministic.


Steps to Reproduce:
1. Modify mm_cfg.py. Set VAR_PREFIX  = '/srv/mm_var'
2. Create a new mailing list (bin/newlist)
3. Attempt to remove the mailing list (bin/rmlist)


Actual results:
# rmlist -a test6
test6 list info not found as /srv/mm_var/lists/test6


Expected results:
# rmlist -a test8
Removing list info


Additional info:
When a new list is created, the path is obtained by using get_listpath() in Mailman/Site.py. The correct behaviour is shown here.
    def get_listpath(listname, domain=None, create=0):
        path = os.path.join(mm_cfg.LIST_DATA_DIR, listname)

However, the version of rmlist provided with RHEL uses "lists" as a hardcoded string and joins it with VAR_PREFIX.
        REMOVABLES = [
            (os.path.join('lists', listname), C_('list info')),
            ]

    for dirtmpl, msg in REMOVABLES:
        dir = os.path.join(mm_cfg.VAR_PREFIX, dirtmpl)
        remove_it(listname, dir, msg)