Replace ldap-utils with cURL

• docker run -d --name openldap -p 1389:1389 bitnami/openldap:2.6.8
• docker ps
• openldap up and running
• docker exec -it openldap ldapsearch -H ldap://localhost:1389 -x -b dc=example,dc=org
• numEntries: 5
• ldapsearch -H ldap://localhost:1389 -x -b dc=example,dc=org
• ldapsearch: No such file or directory
• curl ldap://localhost:1389/dc=example,dc=org??sub
• numEntries: 5

curl: (56) Failure when receiving data from the peer

 Maybe add User-Agent header can solve it.

Jenkins Agent Connect Fail: Did not receive X-Remoting-Capability header

 Jenkins node name is case-sensitive.