configure: require libseccomp 2.2.0

configure: require libseccomp 2.2.0

The following patch is going to require TSYNC, which is only available
since libseccomp 2.2.0.

libseccomp 2.2.0 was released February 12, 2015.

According to repology, libseccomp version in different distros:

  RHEL-7: 2.3.1
  Debian (Stretch): 2.3.1
  OpenSUSE Leap 15: 2.3.2
  Ubuntu (Xenial):  2.3.1

This will drop support for -sandbox on:

  Debian (Jessie): 2.1.1 (but 2.2.3 in backports)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Eduardo Otubo <otubo@redhat.com>
(cherry picked from commit d0699bd37c48067cffbd80383172efc29da6d2f9)
*CVE-2018-15746
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>