autofs: delete possible duplicate of an autofs entry
    
    Steps to reproduce:
    1. Create the following autofs objects
    ```ldif
    dn: ou=auto.master,ou=autofs,dc=ldap,dc=vm
    objectClass: automountMap
    objectClass: top
    ou: auto.master
    
    dn: automountKey=/home,ou=auto.master,ou=autofs,dc=ldap,dc=vm
    objectClass: automount
    objectClass: top
    automountInformation: auto.home
    automountKey: /home
    
    dn: ou=auto.home,ou=autofs,dc=ldap,dc=vm
    objectClass: automountMap
    objectClass: top
    ou: auto.home
    
    dn: automountKey=/home1,ou=auto.home,ou=autofs,dc=ldap,dc=vm
    objectClass: automount
    objectClass: top
    automountInformation: home1
    automountKey: /home1
    ```
    
    2. Use e.g. the test tool to fetch the maps:
    ```
      ./autofs_test_client auto.master
      ./autofs_test_client auto.home -n /home1
    ```
    
    3. Change automountInformation of /home1
    ```
    dn: automountKey=/home1,ou=auto.home,ou=autofs,dc=ldap,dc=vm
    objectClass: automount
    objectClass: top
    automountInformation: home1_1
    automountKey: /home1
    ```
    
    4. Run the test tool again:
    ```
      ./autofs_test_client auto.master
      ./autofs_test_client auto.home -n /home1
      > error happens
    ```
    
    It is important the `get entry by name is called` thus the `-n` parameter.
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/4116