proc: Allocate and get vma fstat in vma_get_mapfile

We will need to detect aio mappings soon, so this is a preparation,
that makes future patching simpler.

Also move aufs stat-ing into aufs code to keep more aufs logic in
one place.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
arm: fix compilation on ARMv7

/tmp/ccq2xzf8.s: Assembler messages:
/tmp/ccq2xzf8.s:5748: Error: thumb conditional instruction should be in IT block -- strexeq r1,r2,[r3]'

Cc: Alexander Kartashov <alekskartashov@parallels.com>
Cc: Ruslan Kuprieiv <kupruser@gmail.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
zdtm/cwd02: avoid resolving an abs path

We may not have permissions for this.

Reported-by: Mr Jenkins
Fixes: 7dbd38dbc939 ("zdtm: set additional groups along with uids and gids")
Cc: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>