Revert "runtests: Don't start if linuxcnc or hal is already running"
Revert "runtests: Don't start if linuxcnc or hal is already running"

This reverts commit 0cc034c6e81873b627204904adf1c681ac8370cb.

The lockfile is currently inadequate, because it provides no way to
check if it's stale or not.  If linuxcnc crashes or otherwise doesn't
get to shut down cleanly, then the lock file will remain but be stale.

jaguarcat79/ILC-with-LinuxCNC,EqAfrica/machinekit,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,narogon/linuxcnc,Cid427/machinekit,RunningLight/machinekit,kinsamanka/machinekit,bmwiedemann/linuxcnc-mirror,ArcEye/MK-Qt5,strahlex/machinekit,ikcalB/linuxcnc-mirror,araisrobo/machinekit,araisrobo/machinekit,ArcEye/MK-Qt5,aschiffler/linuxcnc,RunningLight/machinekit,bobvanderlinden/machinekit,araisrobo/machinekit,cdsteinkuehler/linuxcnc,araisrobo/machinekit,cdsteinkuehler/MachineKit,ArcEye/MK-Qt5,kinsamanka/machinekit,EqAfrica/machinekit,unseenlaser/linuxcnc,RunningLight/machinekit,unseenlaser/linuxcnc,ianmcmahon/linuxcnc-mirror,jaguarcat79/ILC-with-LinuxCNC,bobvanderlinden/machinekit,jaguarcat79/ILC-with-LinuxCNC,RunningLight/machinekit,mhaberler/machinekit,bobvanderlinden/machinekit,aschiffler/linuxcnc,EqAfrica/machinekit,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,unseenlaser/machinekit,Cid427/machinekit,bobvanderlinden/machinekit,araisrobo/machinekit,bmwiedemann/linuxcnc-mirror,ArcEye/machinekit-testing,cdsteinkuehler/MachineKit,unseenlaser/machinekit,bobvanderlinden/machinekit,aschiffler/linuxcnc,RunningLight/machinekit,cdsteinkuehler/MachineKit,araisrobo/machinekit,ArcEye/machinekit-testing,mhaberler/machinekit,narogon/linuxcnc,bobvanderlinden/machinekit,cdsteinkuehler/linuxcnc,araisrobo/machinekit,EqAfrica/machinekit,ianmcmahon/linuxcnc-mirror,Cid427/machinekit,ArcEye/machinekit-testing,unseenlaser/machinekit,kinsamanka/machinekit,narogon/linuxcnc,strahlex/machinekit,bmwiedemann/linuxcnc-mirror,araisrobo/machinekit,strahlex/machinekit,aschiffler/linuxcnc,mhaberler/machinekit,cdsteinkuehler/MachineKit,ikcalB/linuxcnc-mirror,bobvanderlinden/machinekit,kinsamanka/machinekit,unseenlaser/machinekit,unseenlaser/machinekit,aschiffler/linuxcnc,narogon/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,RunningLight/machinekit,Cid427/machinekit,Cid427/machinekit,ArcEye/MK-Qt5,cdsteinkuehler/linuxcnc,narogon/linuxcnc,ArcEye/MK-Qt5,ArcEye/machinekit-testing,ikcalB/linuxcnc-mirror,jaguarcat79/ILC-with-LinuxCNC,bobvanderlinden/machinekit,strahlex/machinekit,mhaberler/machinekit,unseenlaser/linuxcnc,cdsteinkuehler/MachineKit,ianmcmahon/linuxcnc-mirror,RunningLight/machinekit,mhaberler/machinekit,mhaberler/machinekit,strahlex/machinekit,Cid427/machinekit,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,cdsteinkuehler/linuxcnc,EqAfrica/machinekit,kinsamanka/machinekit,ianmcmahon/linuxcnc-mirror,ArcEye/machinekit-testing,unseenlaser/machinekit,cdsteinkuehler/MachineKit,cdsteinkuehler/linuxcnc,mhaberler/machinekit,strahlex/machinekit,kinsamanka/machinekit,Cid427/machinekit,unseenlaser/linuxcnc,EqAfrica/machinekit,ArcEye/machinekit-testing,ArcEye/MK-Qt5,ianmcmahon/linuxcnc-mirror,cdsteinkuehler/linuxcnc,ArcEye/machinekit-testing,RunningLight/machinekit,ArcEye/machinekit-testing,EqAfrica/machinekit,araisrobo/machinekit,ArcEye/MK-Qt5,ArcEye/MK-Qt5,ianmcmahon/linuxcnc-mirror,strahlex/machinekit,unseenlaser/machinekit,mhaberler/machinekit,Cid427/machinekit,unseenlaser/linuxcnc,ianmcmahon/linuxcnc-mirror,EqAfrica/machinekit,unseenlaser/machinekit,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror