VMM: Unified parameter names and option names.
handler: Handler.user_delete() renamed parameter:
delete_home -> del_dir
The same as in Handler.domain_delete().
cli/subcommands: renamed userdelete's option
--delete-home -> --delete-directory
So people have to memorize only one option name. It also matches the
setting names of vmm.cfg.
# use glob syntax.
syntax: glob
*~
*.py?
.*.swp
.swp
build
debian/vmm
debian/*.log
debian/*.debhelper
debian/files
debian/*substvars
.pc
*.egg-info