[Bugs] [Bug 1428050] New: performance/md-cache: Fix caching for root inode

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1428050

            Bug ID: 1428050
           Summary: performance/md-cache: Fix caching for root inode
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: vbellur at redhat.com
                CC: bugs at gluster.org



performance/md-cache: Fix caching for root inode

Summary:
- `is_mdc_key_satisfied()` is returning 0 when it has not checked any of the
keys
- This causes the cache'd value for the root inode to always be invalid
(`mdc_xattr_satisfied()` returns 0, which causes us to jump to `uncached').
- In this diff we add a new option called "strict-xattrs", when enabled winds
getxattr calls for those keys not present in our cache.
- This allows "special" getxattr commands (quota cli commands for example) to
work when md-cache is enabled.
- This is a port of D4135452

Test Plan:
- Test on devserver and see latency improvements for root inode.
- Prove tests

Signed-off-by: Shreyas Siravara <sshreyas at fb.com>

Change-Id: I8ff75595e821d7a714224b3b3dded23f0a93560a
Reviewed-on: http://review.gluster.org/16060
Smoke: Gluster Build System <jenkins at build.gluster.org>
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Kevin Vigor <kvigor at fb.com>
Tested-by: Shreyas Siravara <sshreyas at fb.com>
NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>

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