Added the infra SOPs ported to asciidoc.

modules/sysadmin_guide/pages/mirrorhiding.adoc

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+= Mirror hiding Infrastructure SOP
+
+At times, such as release day, there may be a conflict between Red Hat
+trying to release content for RHEL, and Fedora trying to release Fedora.
+One way to limit the pain to Red Hat on release day is to hide
+download.fedora.redhat.com from the publiclist and mirrorlist
+redirector, which will keep most people from downloading the content
+from Red Hat directly.
+
+== Contact Information
+
+Owner::
+  Fedora Infrastructure Team
+Contact::
+  #fedora-admin, sysadmin-main, sysadmin-web group
+Location::
+  Phoenix
+Servers::
+  app3, app4
+Purpose::
+  Hide Public Mirrors from the publiclist / mirrorlist redirector
+
+== Description
+
+To hide a public mirror, so it doesn't appear on the publiclist or the
+mirrorlist, simply go into the MirrorManager administrative web user
+interface, at [45]https://admin.fedoraproject.org/mirrormanager. Fedora
+sysadmins can see all Sites and Hosts. For each Site and Host, there is
+a checkbox marked "private", which if set, will hide that Site (and all
+its Hosts), or just that single Host, such that it won't appear on the
+public lists.
+
+To make a private-marked mirror public, simply clear the "private"
+checkbox again.
+
+This change takes effect at the top of each hour.