Bug#4098 - mod_sftp unable to use SFTPHostKey due to being group readable in
CentOS 7.
Add integration/regression test for Bug#4098, and improve the log message
when insecure permissions on hostkey files are found.
More changes (including docs) needed for implementing fix Bug#4098.
Merge pull request #44 from proftpd/sftp-hostkey-perms-bug4098

Bug#4098 -  mod_sftp unable to use SFTPHostKey due to being group readable in CentOS 7.
Update NEWS, RELEASE_NOTES for fix for Bug#4098.
Add a FAQ section to mod_rlimit, for the RLimitChroot directive.
Make sure the fix for Bug#4094 is applied to mod_sftp's handling of Display
variables as well.
Doc typo.
Add FAQ about disabling mod_facts module entirely.
Slightly better anchor name.
Merge branch 'master' into core-host-cmd-bug3289