logrotate: delay compression of rotated files

Most of the time, the logging process keeps the log open, accesses it via
a file descriptor and gets notified of log rotation via a signal. Because
logrotate does not wait that the log is close (could it do it with inotify ?),
there can be race conditions between the compression and events that are logged
at the same time.

In the case of NEO, logs are SQLite DB. Rotation is also notified via a signal
and VACUUM is sometimes called to reduce its size.
dcron: fix conversion from systemd timespecs with steps, and add minutely/yearly aliases
Do not generate service for TIDStorage if tidstorage-wrapper option is not set

TIDStorage is used to manage backups but most of time the DB is not splitted
and there's no need to run a TIDStorage daemon.
HelloWorld: Add an example of how to get an IP address to bind to

also fix a few typos and reference to slapgrid
slapos.cookbook:wrapper : allow empty lines in environment
version up : groonga 4.0.8 and mroonga 4.08.
version up : HAProxy 1.5.9.
version up eggs.
version up : firefox 34.0.5.