roomservice: Fix handling of devices with _ in their name

Currently, roomservice takes every _ in the device tree name and
replaces it with /

Instead, strip the device name (such as pollux_windy) from the repo
name before replacing _ with / and then append it again when we're done

Change-Id: Ieabe85ecd8829c959a7296e5cd73f577879c4ffc
roomservice: urgent: add "+fork:true"

Enable a device config to be found on github if it was forked

thx @cybojenix

Change-Id: Ic63f82b9ed754dcba17725f5aa75d0011896b09c