Fix misleading docstring
Fix misleading docstring

The docstring of running() mentions that it must run as root, which is
not accurate. It needs to run as root only if `check_anycast_healthchecker.py`
doesn't run under the same user as anycast-healthchecker.

Related to #21

unixsurfer/anycast_healthchecker,unixsurfer/anycast_healthchecker,unixsurfer/anycast_healthchecker