RADIUS: Fixup the previous commit.

RADIUS: Fixup the previous commit.

Use GET_ macros and C99 uint types. Use nd_printn() to print RADIUS
strings, which are not NUL-terminated (see RFC 2865 page 25). Use
p_ntp_time() to print NTP timestamps. In print_attr_location_data() print
the Location field as hex and add a comment to explain why. In
print_basic_location_policy_rules() display any non-zero MBZ bits in the
Flags field. Make output format more consistent. Update the test case.