vfs_fruit: enabling AAPL extensions must be a global switch

vfs_fruit: enabling AAPL extensions must be a global switch

Apple's SMB2 AAPL extension is enabled once per SMB2
connection. Unfortunately the (per se correct) fix for bug #12541
results in vfs_fruit checking a per tcon config state variable to
determine whether AAPL has been negotiated. This variable will be false
for all but the first tcon. We must make it a global variable.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=12604

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>
Autobuild-User(master): Uri Simchoni <uri@samba.org>
Autobuild-Date(master): Thu Mar  2 04:34:10 CET 2017 on sn-devel-144