ovirt-iso-uploader: using API SDK insecure parameter

Correctly mapping command line insecure parameter to
API SDK insecure parameter.

Change-Id: I2c76ee34b51bfe111ff319f4e75b7ddb09f03bcf
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1102535
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>
(cherry picked from commit e89dcdfad8977030ba9e86af673fe8d102cab414)