[#76] Initial implemention to dhcpctl_timed_wait_for_completion

[#76] Initial implemention to dhcpctl_timed_wait_for_completion

common/conflex.c
includes/dhctoken.h
dhcpctl/omshell.c
    Added support for "disconnect"

dhcpctl/cltest.2 - new file that exercizes timed waits and disconnect

dhcpctl/Makefile.am.in
    Added cltest2.c

dhcpctl/dhcpctl.*
    dhcpctl_timed_wait_for_completion() - new function
    dhcpctl_disconnect() - new function
    Added debug logging

omapip/dispatch.c
    Added protocol logging

    omapi_wait_for_completion()
        Fixed dangling waiter reference

    omapi_one_dispatch()
        Added logic to skip emit writefds from select list

omapip/support.c
    Changed annoying DEBUG logs to DEBUG_PROTOCOL