foreman: Increase minion connection timeouts
foreman: Increase minion connection timeouts

At scale (64 nodes) the foreman can take longer than 10 seconds to
reach all of it's minions.  There are some underlying inefficiencies
here that could be improved, but for now increasing the timeout seems
to help.

kelda/kelda,LuiseV/quilt,LuiseV/quilt,NetSys/quilt,kelda/kelda,LuiseV/quilt,kelda/kelda,NetSys/quilt,NetSys/quilt,quilt/quilt,kelda/kelda,LuiseV/quilt,NetSys/quilt,quilt/quilt,quilt/quilt,quilt/quilt,NetSys/quilt,LuiseV/quilt