Enable building against MIT Kerberos 1.10

Author: frozencemetery

.travis.yml

@@ -5,8 +5,9 @@ python:
   - "3.4"
 
 env:
-  - KRB5_PPAS="sssd/updates"
-  - KRB5_PPAS="rharwood/krb5-1.13 sssd/updates"
+  - KRB5_PPAS="" # 1.10
+  - KRB5_PPAS="sssd/updates" # 1.12
+  - KRB5_PPAS="rharwood/krb5-1.13 sssd/updates" # 1.13
 
 install:
   - "sudo sed -i '1i 127.0.0.1 test.box' /etc/hosts"