Undo change to require WebOb 1.2.3, instead, require only >=1.0.8
Undo change to require WebOb 1.2.3, instead, require only >=1.0.8

This allows ceilometer to use 1.2.3, without breaking devstack for
quantum in the mean time.

See bug #1092227

Change-Id: I1d1b4c0b6dbb917ddf785bdf7ce90be9beb6540c

gkotton/vmware-nsx,gkotton/vmware-nsx