tool: fix typo 'environemnt'->'environment'

Change-Id: I0a5bfdcb0ded8a9b77afffad4a2237e440a8dddc
Signed-off-by: Mooli Tayer <mtayer@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34044
Reviewed-by: Dima Kuznetsov <dkuznets@redhat.com>
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>