Remove arguments from configure options

It's not necessary to specify an argument to the service, failure delay
and success delay options. These are actually optional so the help
strings should not give the impression that they are needed. Remove them
from the help strings.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>
Describe what it means to set the options

The descriptions of the build options could be improved. The delays are
for example just described as delays, but not what they delay. And the
timeout could mention that it terminates the program. Improve the build
options so that they describe what they actually do.

Signed-off-by: Marcus Karlsson <mk@acc.umu.se>