all boards identified as offline if one board is

lavacli works fine now and it lists only the Idle,Good boards 

The code for checking device status is here: https://git.automotivelinux.org/ci-management/tree/jjb/common/include-agl-lava-labs-prepare.sh#n123

The current way of doing the grep and then splitting into lines via an array will only handle the first board listed.

@clabbe: can you please fixup this detection to be able to handle the case when the `devices list` returns more than one board.

Note that we'll need to fix this for the lava-tool version, and the (currently unused) lavacli version just above in the same file.