dev-vagrant-docker: Clear redis-server ExecStart before overriding it.
dev-vagrant-docker: Clear redis-server ExecStart before overriding it.

Real systemd requires this.  docker-systemctl-replacement currently
doesn’t but maybe it will later.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulipchat.com>

rht/zulip,timabbott/zulip,rht/zulip,andersk/zulip,andersk/zulip,tommyip/zulip,rishig/zulip,timabbott/zulip,andersk/zulip,andersk/zulip,punchagan/zulip,rht/zulip,kou/zulip,hackerkid/zulip,brainwane/zulip,kou/zulip,zulip/zulip,zulip/zulip,andersk/zulip,showell/zulip,eeshangarg/zulip,punchagan/zulip,timabbott/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,showell/zulip,brainwane/zulip,showell/zulip,rht/zulip,synicalsyntax/zulip,synicalsyntax/zulip,eeshangarg/zulip,eeshangarg/zulip,timabbott/zulip,brainwane/zulip,tommyip/zulip,tommyip/zulip,hackerkid/zulip,punchagan/zulip,synicalsyntax/zulip,punchagan/zulip,rishig/zulip,synicalsyntax/zulip,rishig/zulip,kou/zulip,tommyip/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,shubhamdhama/zulip,synicalsyntax/zulip,zulip/zulip,shubhamdhama/zulip,rishig/zulip,brainwane/zulip,timabbott/zulip,tommyip/zulip,timabbott/zulip,punchagan/zulip,eeshangarg/zulip,showell/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,shubhamdhama/zulip,tommyip/zulip,shubhamdhama/zulip,brainwane/zulip,rishig/zulip,rishig/zulip,andersk/zulip,shubhamdhama/zulip,andersk/zulip,eeshangarg/zulip,tommyip/zulip,zulip/zulip,brainwane/zulip,hackerkid/zulip,rht/zulip,rht/zulip,zulip/zulip,kou/zulip,showell/zulip,shubhamdhama/zulip,eeshangarg/zulip,synicalsyntax/zulip,brainwane/zulip,shubhamdhama/zulip,zulip/zulip,rishig/zulip,timabbott/zulip,kou/zulip,hackerkid/zulip,showell/zulip,kou/zulip,synicalsyntax/zulip,showell/zulip