Move test_user_management.robot under tests_ldap

- Move test_user_management.robot under tests_ldap directory.

Change-Id: I8bf48ec7527e3daa2aa795a1eff7e6bdf15de19e
Signed-off-by: Sivas SRR <sivas.srr@in.ibm.com>
diff --git a/extended/test_user_management.robot b/tests_ldap/test_user_management.robot
similarity index 100%
rename from extended/test_user_management.robot
rename to tests_ldap/test_user_management.robot