Fixed an improper handling of 'ssh-add -L'
Fixed an improper handling of 'ssh-add -L'

Recent refactoring introduced a regression in 'bosh ssh',
as 'ssh-add -L' output was incorrectly parsed. Fixed by properly
spliitng on a newline, not space.

Change-Id: Id692c54da5a48249688b2f3bb012c940eab795a2

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh