webadmin: send ssh keys in cloud init

set to ssh keys field the correct value,
probably a copy-paste error.

Change-Id: Ia98613d7d235900c8b0712c7f8d3e8ce4e690f77
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1004829
Signed-off-by: Omer Frenkel <ofrenkel@redhat.com>