dashboard: optionally cache displayed bug groups

For upstream Linux namespace, it sometimes takes up to 5-10 seconds to
load the main page. That is too much and the reason for this is
datastore not being intended for frequent querying of thousands of
entities from the database.

Let's take a step forward and at least cache the bugs we display on the
main page. Once in a minute, query them for all access levels, compress
and save to the memcached.

Only do it for non-filtered bugs, because otherwise it works fast
enough.

As the next step we could also take care of terminal pages.

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