Install dependent eggs scripts for slaprunner
Before https://lab.nexedi.com/nexedi/slapos/commit/0ce9ba5dcb26b30a6f3ad1221b78c4cd8cea7ee2 scripts from slapos.core were generated in slaprunner software and it's no longer the case.
This causes the problem discussed in https://lab.nexedi.com/nexedi/slapos/merge_requests/235#note_51430 and probably more, because slaproxy does not start in the instance:
$ ~/bin/supervisorctl
listener-slapgrid RUNNING pid 2494, uptime 0:44:28
slapgrid-cp STOPPED Not started
slapgrid-sr STOPPED Not started
slapproxy FATAL can't find command '/opt/slapgrid/49bfd51226d7b8442eb6ec5805982264/bin/slapos'
supervisor>