[pcp] use socket.gethostname() instead of shelling out

There's no need to take a fork to retrieve the system host name.
Use the socket.gethostname() function instead (plugins also have
no businness importing things from sos.utilities directly - all
the useful functions in there have wrapper methods in the Plugin
class, e.g. call_ext_prog(), check_ext_prog() etc.).

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

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