Change AuthorizeSecurityGroupIngress.Icmp(Code|Type) type
Change AuthorizeSecurityGroupIngress.Icmp(Code|Type) type

Follow-up to 55d713e35cccb11e4c60e81e7de065466730700f, this change
modifies the type used for `AuthorizeSecurityGroupIngress.Icmp(Code|Type)`
to `int` to support -1 value.

pyr/egoscale