Update git submodules

* Update puppet-graphite from branch 'master'
  - Merge "Enable RFC 6797 HSTS signaling"
  - OpenDev Migration Patch
    
    This commit was bulk generated and pushed by the OpenDev sysadmins
    as a part of the Git hosting and code review systems migration
    detailed in these mailing list posts:
    
    http://lists.openstack.org/pipermail/openstack-discuss/2019-March/003603.html
    http://lists.openstack.org/pipermail/openstack-discuss/2019-April/004920.html
    
    Attempts have been made to correct repository namespaces and
    hostnames based on simple pattern matching, but it's possible some
    were updated incorrectly or missed entirely. Please reach out to us
    via the contact information listed at https://opendev.org/ with any
    questions you may have.
    
  - Enable RFC 6797 HSTS signaling
    
    The HTTP Strict Transport Security (HSTS) mechanism defined in IETF
    RFC 6797 allows us to indicate to clients that the site to which
    they are connecting should only every be reached over an encrypted
    HTTPS connection, in an effort to thwart protocol downgrade attacks
    which could convince a client to fall back to plaintext HTTP. Set
    such a policy header for the SSL vhost, valid for one year, and
    indicate that this policy also applies to any subdomains of the
    hostname with which the site is served (even though it's unlikely
    that there would ever be any in this case, this is useful for
    consistency with inclusion in other vhost templates in the future).
    While HSTS policy can't prevent downgrade attacks the very first
    time a client connects to this site, thereafter their browser would
    be wary of connecting over plain HTTP for subsequent connections for
    a full year.
    
    Change-Id: If5c2f3b70e7f7646bf6168e8942aee0ecb7c2ec8

puppet-graphite

@@ -1 +1 @@
-Subproject commit 8a0e111327d5d2e0e387edcfe4493ddac9d63c70
+Subproject commit 7ee0c28e0cb738b3a02b48b447e3d3221089554e