[PATCH] remove stripe chunk size limitation for striped volumes in LVM2

[AJ Lewis <aj@terrascale.net>]

This patch removes the artificial limitation on stripe size that lvm2  
had for backwards compatibility with lvm1.  It is now only limited by  
the size of the variable used to store the chunk size.

o Adds a new flag 'FMT_UNLIMITED_STRIPESZ' and sets it for format_text.
   lvcreate checks the flag and if it is set, ignores the  
MAX_STRIPE_SIZE.
o There is also a check added in lvcreate.c:_read_stripe_params to  
prevent
   lp->stripe_size from overflowing, but this is not absolutely  
necessary for
   the rest of the patch.
o The 2^30 limitation for stripe chunk size in lvm2 is because of the  
32-bit
   variable that holds the chunks size.  See the comment in  
lvcreate.c for more
   details.
o Note that the check for MAX_STRIPE_SIZE has been moved into  
_lvcreate() so
   that the format flag for the VG can be checked - if there's a way  
to get a
   valid flag in _read_stripe_params() it should be moved back  
there, but the
   cmd->fmt structure there always is format_text.

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