networkd: Fix typo in networkd.init
networkd: Fix typo in networkd.init

To get the PID, we had been calling $(cat ${NETWORKD}), which has the effect of
actually cat'ing the networkd executable. We must have meant to do $(cat
${PID_FILE}) instead.

Signed-off-by: Mike McClurg <d5d39725aee3103039228164deec3c7acc6f60e3@citrix.com>

koushikcgit/xcp-networkd,djs55/squeezed,robhoes/squeezed,djs55/xcp-rrdd,djs55/xcp-networkd,djs55/xcp-networkd,sharady/xcp-networkd,koushikcgit/xcp-networkd,djs55/xcp-rrdd,koushikcgit/xcp-rrdd,johnelse/xcp-rrdd,sharady/xcp-networkd,simonjbeaumont/xcp-rrdd,johnelse/xcp-rrdd,koushikcgit/xcp-rrdd,koushikcgit/xcp-rrdd,simonjbeaumont/xcp-rrdd