RBD: build prerequisites for latest xfstests and update test configuration

RBD: build prerequisites for latest xfstests and update test configuration

To standardize results from xfstests, install specific versions of xfstests,
xfsprogs, and xfsdump in /tmp. Move test mountpoints to /tmp/cephtest to allow
access for fsgqa user expected by xfstests.

XXX: xfsdump required significant hacks to build and install on Ubuntu 14.04.
A developer removed the definitions of the min and max macros; this commit is
reverted by this script. The installation paths are difficult to override and
the installer breaks (trying to ln one of the binaries to itself) when an
alternate installation location is specified. This script ignores this error
(make -k install || true).

Signed-off-by: Douglas Fuller <dfuller@redhat.com>