update jsonschema requirements to match reality

all our tools work fine with jsonschema 2.0, as we run it in the
gate today (and for months) due to the global requirements race.
The real glance requirement is really >= 1.3.0. The !=1.4.0
remains because of a misrelease by the jsconschema of 2.0 as
1.4.0... poorly.

Change-Id: I88ccf6dca223c825ef98eed50e2270694d05955c
Merge "update jsonschema requirements to match reality"