the SSL private key would be overwritten if ssl_certificate.pem file was deleted; maybe the cause of #98

* check that the PUBLIC_IP is not listed in zen.spamhaus.org
* check that the PRIMARY_HOSTNAME is not listed in dbl.spamhaus.org
* check that a connection to Google's MTA is working (i.e. we're not on a residential network that blocks outbound port 25)

see #118

the cron job to re-sign DNSSEC zones was still not working because the script needed a hash-bang line; what I did in 65c3a44e didn't actually fix the problem

fixes #116

Rather than pass `-r /dev/random` to ldns-keygen (it was `-r /dev/urandom`),
don't pass `-r` at all since /dev/random is the default.

Merges branch 'master' of github.com:pysiak/mailinabox

/dev/random should be used for crypto-grade RNG.

To make sure use of /dev/random doesn't stall due to lack of entropy, install haveged which fills the entropy pool with sources such as network traffic, key strokes, etc.

On branch master
Your branch is up-to-date with 'origin/master'.

Changes to be committed:
	modified:   setup/dns.sh
	modified:   setup/system.sh
	modified:   setup/webmail.sh

dont serve web for domains with custom DNS records that point A/AAAA elsewhere, and in whats_next only check that an A record exists on a domain if we are serving web on the domain

the cron job to re-sign DNSSEC zones wasnt working after adding the API key to the management daemon because the script relied on a bash-ism but cron runs it with (probably) sh

Merges branch 'patch-1' of https://github.com/sfPlayer1/mailinabox

Add new extra bool parameter.

The dns_update script didn't generate IPv6 (AAAA) glue records for the name servers.

This caused http://dnscheck.pingdom.com to complain about a mismatch between the glue records reported by the parent name server and mailinabox nsd.

Here's the failing dnscheck output for reference:
> Checking glue for ns1.my.domain.tld (1.2.3.4).
> Child glue for bgwe.eu found: ns1.my.domain.tld (1.2.3.4)
> Checking glue for ns1.my.domain.tld (1234::1).
> Missing glue at child: ns1.my.domain.tld
> Checking glue for ns2.my.domain.tld (1.2.3.4).
> Child glue for bgwe.eu found: ns2.my.domain.tld (1.2.3.4)
> Checking glue for ns2.my.domain.tld (1234::1).
> Missing glue at child: ns2.my.domain.tld

I'm not very familiar with Python and DNS, please verify ;)

don't create a www. subdomain on any domains that are themselves subdomains within a zone, i.e. don't create www.PUBLIC_HOSTNAME if PUBLIC_HOSTNAME is a subdomain of another domain, which is what we normally recommend

run management/dns_update.py from the console to dump the DNS records, with explanations, in case the user wants to host DNS off of the box

Output SSL Cert Fingerprint can point to a wrong dir: Better to use $STORAGE_ROOT

Better to use $STORAGE_ROOT instead of hardcoded /home/user-data/

This reverts pull request #105 from jonessen96/master (84d2023f) which was incorrect because it lost the "+" in DOT_ATOM_TEXT and so was not accepting any email addresses.

Am taking the opportunity to make the code cleaner while I'm here.

Fix validate_email not accepting catchalls (empty local part of the address)

This lets roundcube's manageseive plugin do cool things like vacation responses.

Also:

* Run the spam filtering sieve script out of a global sieve file that we'll place in /etc/dovecot. It is no longer necessary to create per-user sieve files for this. Remove them with a new migration. Remove the code that created them.

* Corrects the spam script. Backslashes were double-escaped probably because this script started embedded within the bash script. Not sure how this was working until now.

this adapts work by @h8h in #103

As the scripts keep growing, it's time to split them up to
keep them understandable.

This splits mail.sh into mail-postfix.sh, mail-dovecot.sh,
and mail-users.sh, which has all of the user database-related
configurations shared by Dovecot and Postfix. Also from
spamassassin.sh the core sieve configuration is moved into
mail-dovecot.sh and the virtual transport setting is moved
into mail-postfix.sh.

Also revising one of the sed scripts in mail-dovecot to
not insert a new additional # at the start of a line each
time the script is run.

closes #94