Group created in LDAP server with single integer name cannot be synced with OC

[kiranparajuli589]

Description

Using ldap server there is no problem to create group with single integer name but actually we donot get those group as oc group after a sync.

Steps to reproduce:

1. create a LDAP group with regular ou, with group-name/cn = 0 (single integer value)
2. sync ldap-group with OC server
3. view group list using occ command

Expected Output:

• Group with name 0 should be listed

Actual Output:

• No group with name 0 is listed