Require WebOb>=1.6.0
Require WebOb>=1.6.0

Nova change 4e923eb9a660593b8a7d2522992700182978a54c started
using the json_formatter kwarg which was introduced in WebOb
1.6.0:

https://github.com/Pylons/webob/commit/87c8749a57c1ff2442db2d74d9fb86935b7b201e

So we need to raise the minimum required version for nova to use.

Change-Id: Ia778a11afb03b6d4b57dbd55a801a5a28b10541d
Depends-On: I2bbad0c059cc514ba0be1d42c061056a342caadc
Closes-Bug: #1632723

jianghuaw/nova,vmturbo/nova,mahak/nova,hanlind/nova,rahulunair/nova,klmitch/nova,klmitch/nova,vmturbo/nova,jianghuaw/nova,gooddata/openstack-nova,Juniper/nova,vmturbo/nova,gooddata/openstack-nova,rajalokan/nova,Juniper/nova,rajalokan/nova,Juniper/nova,openstack/nova,openstack/nova,phenoxim/nova,klmitch/nova,rajalokan/nova,rajalokan/nova,phenoxim/nova,mikalstill/nova,mikalstill/nova,hanlind/nova,Juniper/nova,mahak/nova,gooddata/openstack-nova,vmturbo/nova,klmitch/nova,hanlind/nova,jianghuaw/nova,jianghuaw/nova,mahak/nova,gooddata/openstack-nova,sebrandon1/nova,sebrandon1/nova,rahulunair/nova,openstack/nova,mikalstill/nova,rahulunair/nova,sebrandon1/nova