Description of problem:
When trying to add a default custom info keyname 256 characters long, a success message is displayed. But trying to sync this or any other valid custom info thereafter fails. 

Version-Release number of selected component (if applicable):
katello-common-1.4.2-1.git.997.e699743.el6.noarch
katello-headpin-all-1.4.2-1.git.997.e699743.el6.noarch
katello-selinux-1.4.3-1.git.4.99dc194.el6.noarch
katello-candlepin-cert-key-pair-1.0-1.noarch
katello-cli-1.4.2-1.git.137.fea0d84.el6.noarch
signo-katello-0.0.9-1.el6.noarch
katello-glue-candlepin-1.4.2-1.git.997.e699743.el6.noarch
katello-certs-tools-1.4.2-1.el6.noarch
katello-headpin-1.4.2-1.git.997.e699743.el6.noarch
katello-repos-1.4.2-1.el6.noarch
katello-cli-common-1.4.2-1.git.137.fea0d84.el6.noarch
katello-configure-1.4.3-1.git.67.f71e590.el6.noarch
katello-glue-elasticsearch-1.4.2-1.git.997.e699743.el6.noarch


How reproducible:
Everytime

Steps to Reproduce:
1. org create --name Org1 
2. distributor create --name dist1 --org Org1
3. org default_info add --name Org1 --keyname <key256char> --type distributor
# success message
4. org default_info sync --name Org1 --type distributor
# failed to sync
5. org default_info add --name Org1 --keyname 'FirstKey' --type distributor
# success message
6. org default_info sync --name Org1 --type distributor
# failed to sync

Actual results:
As described above. Result of adding the default info shows success. default_info sync fails.

Expected results:
Validation error: Keyname cannot exceed 256 characters
The other valid default info addition and sync thereafter should work fine too.