sample config: Disable and warn about enable_environment_macros

People really shouldn't be using it, so advise against it in very
strong terms.

Signed-off-by: Andreas Ericsson <ae@op5.se>

git-svn-id: https://nagios.svn.sourceforge.net/svnroot/nagios/nagioscore/trunk@2570 5f96b256-904b-4d8d-8c98-d829582c6739
nerd: Plug a memory leak

We used to leak the individual channels (152 bytes per channel).
Stop doing that and reclaim the memory instead.

Signed-off-by: Andreas Ericsson <ae@op5.se>

git-svn-id: https://nagios.svn.sourceforge.net/svnroot/nagios/nagioscore/trunk@2576 5f96b256-904b-4d8d-8c98-d829582c6739