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keydb.conf: support globbing in include directive
The existing example keydb.conf indicates that wildcard pattern matching is supported for the include directive, i.e. it implies that:
- include /etc/keydb.conf
- include /etc/keydb.d/server-specific.conf
- include /etc/keydb.d/*.conf
should all be supported. However, glob-style matching support is not enabled by the configuration parser. This commit treats the arguments to the include directive as glob patterns via the POSIX standard glob.h library, and calls the loadServerConfig function as many times as necessary - either once (for no pattern), or as many times as there are files matching the pattern.
This is the preferred solution used in other open source projects, see (for example) the implementation in openssh.
This was mentioned in #875 and directly resolves that issue. See also #401 for an earlier discussion.
