[Docs] New Global directive: LockType

[Mike Heins]

For 4.7 only:

=head2 *Global* LockType

Allow setting of default lock type. The default is flock(2) locking,
To change it to fcntl(2) locking:

    LockType    fcntl

The fcntl setting is needed for NFS filesystems, and in order for 
it to work on NFS-connected file systems, the NFS lock daemon (lockd)
must be enabled and running.

Also accepts a LockType of "none", but that is never recommended.
It might be useful to check and see if locking is causing hangs
on the system.

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