GFS2: Use resizable hash table for glocks

This patch changes the glock hash table from a normal hash table to
a resizable hash table, which scales better. This also simplifies
a lot of code.

Signed-off-by: Bob Peterson <[email protected]>
Signed-off-by: Andreas Gruenbacher <[email protected]>
Acked-by: Steven Whitehouse <[email protected]>

Author: AstralBob