Update security polling status for Debian and derivatives

Current versions.
Always assume HAVE_IPV6

With this Solaris 2.6 and 7 is strictly unsupported, as we remove the
configure.ac special casing for them.
Sync schema with mydns-ng
Support mydns-ng style Y/N active field.
improve some wording, remove unneeded \_ escapes
Merge pull request #1636 from zeha/remove-have-ipv6

Always assume HAVE_IPV6
Restore 'aux'
log client IP for immediate SERVFAIL exceptions
improve cache hitrate
remove some dead code
enable callback based metrics to statbas, and add 5 such metrics: uptime, sys-msec, user-msec, key-cache-size, meta-cache-size, signature-cache-size
fix up statbag for carbon protocol and function pointers
Merge pull request #1886 from zeha/secpoll-debian

Update security polling status for Debian
make latency & qsize reporting 'live'. Plus fix that we only reported the qsize of the first distributor.
Merge branch 'master' of github.com:PowerDNS/pdns
mind04 discovered we count corrupt packets and EAGAIN situations as validly received packets, skewing the udp questions/answers graphs on auth.
remove additional layer of trailing . stripping, which broke MX records to the root in the BIND backend. Should close #1243.
don't do time(0) under signature cache lock
Merge branch 'master' of github.com:PowerDNS/pdns
add signatures metric to auth, so we can plot signatures/second