Quagga: Display useful info when doing service quagga status

Quagga: Display useful info when doing service quagga status

Ticket: CM-7132
Reviewed By: CCR-3461
Testing Done: the usual

Today, 'service quagga status' merely sets the return code and nothing
more. Like other services, it'd be good to print some useful output as
well.

Example output:
    cumulus@top1$ sudo service quagga status ospfd
    [ ok ] ospfd-1 is running.
    [ ok ] ospfd-2 is running.
    cumulus@top1$ sudo service quagga status
    [ ok ] zebra is running.
    [ ok ] ospfd-1 is running.
    [ ok ] ospfd-2 is running.
    [ ok ] ospf6d is running.
    cumulus@top1$ sudo service quagga status
    [ ok ] zebra is running.
    [ ok ] ospfd-1 is running.
    [FAIL] ospfd-2 is not running ... failed!
    [ ok ] ospf6d is running.
    cumulus@top1$ echo $?
    1
    cumulus@top1$

Signed-off-by: Dinesh G Dutt <ddutt@cumulusnetworks.com>
Reviewed-by: Donald Sharp <sharpd@cumulusnetworks.com>