EX-4015 lipe: implement lazy size and blocks

EX-4015 lipe: implement lazy size and blocks

If the current file is an OST object or not a regular file then we use
the size and blocks values from the inode. (But this is wrong for
striped directories.) If the current file is an regular MDT inode then
we check for strict or lazy SOM, followed by HSM released, followed by
unstriped.

Rename loa_attr_bits to loa_valid. Add new fields loa_noattr and
loa_error to distinguish among the cases of xattrs we haven't tried to
read, xattrs which are not set, and xattrs which could not be read (or
parsed).

Test-Parameters: trivial testlist=sanity-lipe-find3 serverextra_install_params="--packages lipe-scan"
Test-Parameters: trivial testlist=sanity-lipe-scan3 serverextra_install_params="--packages lipe-scan" facet=mds1
Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: I5b197dd7989a3f618c97c9025a4bd534dfe86152
Reviewed-on: https://review.whamcloud.com/46698
Tested-by: jenkins <devops@whamcloud.com>