patchew-cli: Dedicated exception when server returns error on API calls
patchew-cli: Dedicated exception when server returns error on API calls

Signed-off-by: Fam Zheng <df9fd617995bad07eac70e27aa3fe5069270e3bd@redhat.com>

pvital/patchew,pvital/patchew,pvital/patchew,pvital/patchew