Fis a typo in snmp_autoinstall

Use snmp_password, not snmp_passwd so it clears correctly

Change-Id: I111c42841726c49eb774d233785c497678a78d0d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1062541
Signed-off-by: Ryan Barry <rbarry@redhat.com>
(cherry picked from commit 2891fc2df3b63a287805a9ca5efbb67b755ad0af)