[git pull] misc audit fixes

[Al Viro]

	Audit fixes: a bunch of bug fixes from Amy + overhead reduction for
case when no rules are loaded (lazy-audit) from me.  The latter speeds
"audit enabled, no rules present" to the level of "audit disabled".  The
current tree has about 15--20% overhead for that case on loads like "do a lot
of access(2)"; that gets killed by these patches.

Please, pull from
git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current.git/ audit.b25

diffstat:
 fs/namei.c               |    8 ++-
 include/linux/audit.h    |   43 +++++++++++------
 include/linux/fsnotify.h |    6 +-
 kernel/audit.c           |    4 -
 kernel/auditfilter.c     |   26 ++++++++++
 kernel/auditsc.c         |  117 ++++++++++++++++++++++++++++++-----------------
 6 files changed, 140 insertions(+), 64 deletions(-)

Al Viro:
      introduce audit rules counter
      mark context of syscall entered with no rules as dummy
      don't bother with aux entires for dummy context
      take filling ->pid, etc. out of audit_get_context()

Amy Griffis:
      fix faulty inode data collection for open() with O_CREAT
      fix missed create event for directory audit
      fix oops with CONFIG_AUDIT and !CONFIG_AUDITSYSCALL
      fix audit oops with invalid operator
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