'service quagga reload' should not dump so much output to the log file.

'service quagga reload' should not dump so much output to the log file.
It should also check that quagga is running before attempting to do
any work.

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>
Ticket: CM-7486
Reviewed By: Donald Sharp
Testing Done:

Verified that 'service quagga reload' exits cleanly if quagga is not
running.  Also verified that it produces a minimal amount of log output
by default.  The user can enable --debug in /etc/init.d/quagga if they
would like to enable debug output.