Fix invalid usage of create-space

Before fix:
If cf user uses 'cf create-space' with inavlid usage. it is still
success and ignoring the second parameter, like below
'cf create-space myspace blahblah'

After-Fix:
If cf user uses 'cf create-space myspace blahblah'
it will fail with appropriate error

Issue: http://rnd-github.huawei.com/paas/cli/issues/2