Add /usr/sbin to path when looking for varnishd.
Add /usr/sbin to path when looking for varnishd.

varnish/libvmod-example,aondio/libvmod-rtfrontend,aondio/libvmod-rtfrontend,mbgrydeland/libvmod-fsbackend,Dridi/libvmod-example,aondio/libvmod-cowsay,aondio/libvmod-cowsay,varnish/libvmod-example,aondio/libvmod-rtfrontend,mbgrydeland/libvmod-fsbackend,Dridi/libvmod-example