dev-perl/MogileFS-Server: Bump to version 2.720.0

dev-perl/MogileFS-Server: Bump to version 2.720.0

- EAPI6
- Enable tests ( some appear to auto-skip when servers are missing
    and the objective is to enable them to see what breaks and maximally
    enable all possible end-user tests )
- Rework gentoo /etc/ stuff to use patches instead of explicit
    ${FILESDIR} copies, in order to make it easier for end users to
    tweak installed files with eapply_user, and make it easier to
    construct effective install trees trivially using upstream sources,
    as well as discouraging accidental retroactive changes to existing
    available versions ( happened many times in the past ), while
    encouraging using patch layering to augment incremental changes
    where relevant.
- Remove hacks around mogdeps, which vanished upstream in
    MogileFS-Server 2.56 ( 2011-2012 )
- Use 'checkpath' instead of 'install' in mogilefsd script, and remove
    EQAWARNING use of keepdir /var/run

Upstream:
- Work with DBD::SQLite latest lock errors
- remove update_host_property
- remove users of unreachable_fids table
- batch MySQL updates in monitor
- defer monitor DB updates until all HTTP requests are done
- defer expiry of timed out poolable connections
- disable watch_write before retrying write in poolable connections
- do not write before event_write in poolable connections
- add conn_pool_size config option
- enable TCP keepalives for iostat watcher sockets
- add "readonly" state to overide host device "alive" state

Package-Manager: Portage-2.3.8, Repoman-2.3.3