latest cdtime broken on py3

[doutriaux1]

        data = os.path.join(self.basedatadir, "coads_climatology.nc")
        f = cdms2.open(data)
        s = f["SST"]
        s.info()
        print(s.getTime().asComponentTime())

[doutriaux1]

@muryanto1 this is a good example of why we desperately need your nightly checks!

[doutriaux1]

@dnadeau4 python 2.7 is broken as well. It seems to affect osx only.

[doutriaux1]

@dnadeau4 pointed out this not a bug, "months since 0" is not valid anymore which makes sense. Will update test suites to reflect this.