LU-14198 build: Use pax tar format for build of dist-targets

LU-14198 build: Use pax tar format for build of dist-targets

   The tar ustar format used during build of dist-* targets (which is
   used when building e.g. rpms and debs) has several limitations and
   will prevent e.g. users with uid > 2097151 (2^21) from building
   these targets (or from passing the autoconf test for tar).

   This commit changes format from ustar to POSIX.1-2001/pax which
   will remove this and several other limits (with path-length being
   one relevant example, see LU-12078).

Signed-off-by: Daniel Ahlin <ahlin@google.com>
Change-Id: Ic66ca696ede2e359a04c179c6d630baacaa9bcb1
Reviewed-on: https://review.whamcloud.com/40915
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>