xfsprogs: libxcmd: encapsulate fs_table initialization

xfsprogs: libxcmd: encapsulate fs_table initialization

Change fs_table_initialise() so it takes an array of mount points
and an array of project identifiers as arguments (along with their
respective sizes).

Change the quota code to provide fs_table_initialise() these arrays
rather than doing the individual mount point and project insertion
by itself.  Other users just pass 0 counts, which results in filling
fs_table with entries for all mounted filesystems and all defined
projects.

This allows a few fs_table functions to be given private scope.

Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>