btrfs: move btrfs_realloc_node() from ctree.c into defrag.c

btrfs_realloc_node() is only used by the defrag code. Nowadays we have a
defrag.c file, so move it, and its helper close_blocks(), into defrag.c.

During the move also do a few minor cosmetic changes:

1) Change the return value of close_blocks() from int to bool;

2) Use SZ_32K instead of 32768 at close_blocks();

3) Make some variables const in btrfs_realloc_node(), 'blocksize' and
   'end_slot';

4) Get rid of 'parent_nritems' variable, in both places where it was
   used it could be replaced by calling btrfs_header_nritems(parent);

5) Change the type of a couple variables from int to bool;

6) Rename variable 'err' to 'ret', as that's the most common name we
   use to track the return value of a function;

7) Move some variables from the top scope to the scope of the for loop
   where they are used.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>