FreeNAS 11.3 discovered as FreeBSD

It looks like ixSystems changed the reported sysObjectId again in 11.3.    They now report the following:

For FreeNas boxes - .1.3.6.1.4.1.50536.3.1

For TrueNas boxes - .1.3.6.1.4.1.50536.3.2

I have attached a patch file to detect both of these cases and this has been tested again actual ixSystems FreeNAS and TrueNAS hardware as well as a home built system running FreeNAS.