Handle negative values properly with check_snmp

check_snmp becomes capable of evaluating negative values properly,
but it might be returning CRITICALs where it used to return OK and was ignored,
if a negative value turns out to actually be a valid value.
If negative values are valid, this can be worked around,
by adding "~:" to the warning/critical threshold : 100 -> ~:100
Enable tests in tests/ subdirs
Ignore state directory in suid plugins

If a plugin still has suid privileges at the time np_enable_state() is
called, the MP_STATE_DIRECTORY environment will be ignored.

There is no need for a NEWS entry as no suid plugins use np_enable_state
yet. - Thanks dermoth (https://github.com/monitoring-plugins/monitoring-plugins/commit/68fe713335183dd37ced78821711c2a3f1ea2cc7)
Add tests for negative thresholds in test_utils

Thanks Dermoth - (https://github.com/monitoring-plugins/monitoring-plugins/commit/bc92b9392009766441c67b06398e6925cc45c2aa)
Move negate' translate_state() to utils_base.h

Also changed to strcasecmp, may need additions from gnulib. - Thanks dermoth (https://github.com/monitoring-plugins/monitoring-plugins/commit/8fc9e5ac4b3a699f8d6b78471829692f0c92d5fa)
Update check_swap usage

Update and clarify check_swap usage. - Thanks dermoth (https://github.com/monitoring-plugins/monitoring-plugins/commit/813c02364f55c14fef396d83eed52874d8e16fb2)
Add tests for negative thresholds in test_utils

Thanks dermoth - https://github.com/monitoring-plugins/monitoring-plugins/commit/bc92b9392009766441c67b06398e6925cc45c2aa
Add tests for negative thresholds in check_snmp

Next commit will work on fixing these!
Fix snmpd tests
Add perfdata in check_proc output tests
Fix PATH_TO_QMAIL_QSTAT in configure

When configuring PATH_TO_QMAIL_QSTAT the PATH_TO_MAILQ would get applied instead after tests had passed. Also made --with-qmail-qstat-command a configuration option.
Revert "Fix snmpd tests"

This reverts commit 8909c81b950159b8d39441c90c4acf6a49f9fbe8.
sslutils: expire time in local timezone format

Just turning attached patch of github issue #840 into a push request.
Fix snmpd tests
Merge branch 'maint' of https://github.com/nagios-plugins/nagios-plugins into maint
check_ntp_time: adding offset option

Just turning attached patch of github issue #907 into a push request.
check_dns: add AAAA,MX,TXT,SRV,CNAME

Just turning attached patch of github issue #894 into a push request.
check_ntp_time.c - Cleaned up usage and added a note
Enable extra-opts by default
plugins/check_dns.c: Authoritative response change

Altered output for authoritative message if no dns server was provided, in case of using -A without -s.