core: removing unused event from DB

This patch removes the VDS_INITIATED_RUN_VM_FAIL event which was
replaced with the VDS_INITIATED_RUN_VM_FAILED event.
The patch that introduced the event rename did not clean the old name
from the event_map table.

Change-Id: I199843e37254fee058147795683dce58c3475a55
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1072527
Signed-off-by: Eli Mesika <emesika@redhat.com>