osmo-ctrl2cgi.service: Fix exec path not absolute

systemd errors due to executabl path not being absolute:
systemd[1]: [/lib/systemd/system/osmo-ctrl2cgi.service:7] Executable path is not absolute, ignoring: python3 /usr/bin/ctrl2cgi.py
systemd[1]: osmo-ctrl2cgi.service: Service lacks both ExecStart= and ExecStop= setting. Refusing.

Change-Id: I8e3d695951fb36d53c112b6dce10a275b757ca5a
1 file changed