Raise warlock requirement

Glance PATCH API need use new 'require' condition for schema to validate
income requests.

Raise warlock requirement to >=1.0.1,<2 as older warlock requires a too
old jsonschema to be useful

See bug #1202391 for details.

Change-Id: Iee1b514a6d1387ddc7cae54092fa24d88e3928e3
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>