Add linter fixes and options: * validate identityref arguments to be valid identity names. * fix prefix validation. * check for a '-top' container (warning)
Add linter fixes and options: * validate identityref arguments to be valid identity names. * fix prefix validation. * check for a '-top' container (warning)

openconfig/oc-pyang,openconfig/oc-pyang,openconfig/oc-pyang,openconfig/oc-pyang