openconfig-gnsi-acctz.yang is not updated as per https://github.com/openconfig/gnsi/pull/175/files

[macb2625]

Here idle-timeouts https://github.com/openconfig/public/blob/master/release/models/gnsi/openconfig-gnsi-acctz.yang#L132 is not removed which was removed as part of https://github.com/openconfig/gnsi/pull/175/files. Also why are we maintaining two acctz related yangs. I believe all the yang models were moved to https://github.com/openconfig/public/blob/master/release/models/gnsi/.