pimd: change ranges to 1..max, type align with IETF YANG.

pimd: change ranges to 1..max, type align with IETF YANG.

While defaults are good picks for "reasonable" guesses, min and max
range values really aren't. Operators and experimenters often like to
configure "unreasonable" values to stress test, tests boundary
conditions and explore innovations.

With that in mind, change all ranges to 1..max (of type).

While we're here add optional ignored values in the "no" CLI forms.

Signed-off-by: Christian Hopps <chopps@labn.net>