dracut-functions.sh:find_kernel_modules_by_path() fixed updates search

"updates/*" path does not start with "/"
iscsi: for iBFT read the initiator-name from the correct file

/sys/firmware/ibft/initiator-name should be
/sys/firmware/ibft/initiator/initiator-name

https://github.com/haraldh/dracut/issues/12