The previous uwsgi invocation assumed that the uwsgi binary is in the
same directory as the project binaries are installed into (probably
/usr/bin). That may not be correct -- for example if using a packaged
uwsgi on Fedora the binary will live in /usr/sbin/uwsgi (not /usr/bin
where the project files from pip are).
Switch the invocation to just find it in the path.
Additionally, grenade is disabled, otherwise we cannot land this change
without fixing stable branches first.
(cherry picked from commit