Hide Gerrit permissions projects by default about gitiles HOT 3 CLOSED

[Discussion condensed from another bug tracker.]

The permission container projects like All-Projects, or Kernel-Projects on android
should be hidden by default from the host index. These aren't really interesting for
someone looking at source code.

There are times that an admin wants to browse these, so we should still make them available,
but maybe collapse them under an expand out toggle, or move them to a second page with
a link shown at the bottom of the main project listing.

Possibilities:
-Hide repos where HEAD points to refs/meta/config
-Hide repos that contain only refs/meta/config
-Hide repos that contain no branches or tags
(All of these are straightforwardly implemented in DefaultAccess or other GitilesAccess
implementation.)

Third parties revoke access and is not aurtirise no matter any excuse

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