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Don't attempt to write a report after an arbitrary init time
but after a regular report interval.

AttrTree failed to create correct sub-attributes of itself because the
sub-attributes were not transmitted to the child.
In fact, str.split()'s 2nd argument is the number of split, not
the number of parts so '2' will split in 3 parts.

This allows mail clients to know to what message the followup is for,
making it easy for an user to see what relates to what when there are
several checks.

Some emails client don't know the date if this field is not present,
and although some MTAs add it it can't be relied upon.

This fixes crashing the mail thread when there the queue is empty after
config.emails.smtp_keepalive_timeout seconds.

Use a single SMTP connection and send all emails through it from a
thread to avoid spamming the SMTP server with connections.

Fix all PEP8 errors but E221 (multiple spaces before operator).

Instead of depending on config.py defining several magic variables,
move the default configuration in the config instance at the root of
the lib module, and make config.py override them as needed.

This eases renaming of the module, and helps the uneducated reader
locate the source of the import.

Omitting addresses in Host instanciation now defaults to doc-reserved
IP addresses, so that one can create hosts that are not dual-stacked.

This implementation uses smtplib so that mails are sent via SMTP, even
when the mail daemon could be local, to be as flexible as possible.

Users may configure a name string for hosts, and checks can have a
named option that will be used as target name (useful for mails).
Hosts' name default to "ipv4/ipv6" and checks' to "Unknown" as they
may apply to any kind of things (like hosts of course but also zones, …)

This uses nagios' /usr/lib/nagios/plugins/check_http as packaged
within Debian.

"every" is a loop, meaning that it always has to rotate back to
the begining when the threshold is met. But retry is more like a
ceiling, menaning that after the threshold it is "too much".
So modulo is perfect for "every" and for "retry", use min().

Merge branch 'simpler-count-op' of http://gitlab.netlib.re/b4n/picomon into b4n/picomon-simpler-count-op