s4 group_audit: Add Windows Event Id's to Group membership changes

s4 group_audit: Add Windows Event Id's to Group membership changes

Generate a GroupChange event when a user is created with a PrimaryGroup
membership.  Log the windows event id in the JSON GroupChange message.

Event Id's supported are:
	4728	A member was added to a security enabled global group
	4729	A member was removed from a security enabled global
		group
	4732	A member was added to a security enabled local group
	4733	A member was removed from a security enabled local group
	4746	A member was added to a security disabled local group
	4747	A member was removed from a security disabled local group
	4751	A member was added to a security disabled global group
	4752	A member was removed from a security disabled global
		group
	4756	A member was added to a security enabled universal
		group
	4757	A member was removed from a security enabled universal
		group
	4761	A member was added to a security disabled universal
		group
	4762	A member was removed from a security disabled universal
		group

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>