Added foreground and background options to fail2ban-client
Updated man page for new options
Added f and b to cmdOpts.

f = start server in foreground; b = start server in background (default).
Added more specific help message to fail2ban-client with -f option
Merge pull request #704 from CameronNemo/foreground-opt-client

Add an option in fail2ban-client to pass the foreground option to the server