engine_page: replace log import

Due http://gerrit.ovirt.org/#/c/18927/ that add a log module we must update
engine_page.

Change-Id: Ie8e07b94ae18e1e7fd0c89b9b005f8eb5c0fe7eb
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1019859
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>