setup: remove autofs network dependency

aufofs normally has a dependency on networking, because one of its
purposes is to automount NFS filesystems. TeslaUSB doesn't need that
though, and removing the dependencies speeds up TeslaUSB startup,
especially when booted outside of wifi range.

setup/pi/make-root-fs-readonly.sh

@@ -193,4 +193,13 @@ fi
 # newer than /run/systemd/systemd-units-load
 touch -t 197001010000 /etc/fstab
 
+# autofs by default has dependencies on various network services, because
+# one of its purposes is to automount NFS filesystems.
+# TeslaUSB doesn't use NFS though, and removing those dependencies speeds
+# up TeslaUSB startup.
+if [ ! -e /etc/systemd/system/autofs.service ]
+then
+  grep -v '^Wants=\|^After=' /lib/systemd/system/autofs.service  > /etc/systemd/system/autofs.service
+fi
+
 log_progress "done"