Deprecate ldap_connect with two parameters (#5177)

* Deprecate ldap_connect with two parameters

ldap_connect should be called with an LDAP-URI as parameter and not with
2 parame

Deprecate ldap_connect with two parameters (#5177)

* Deprecate ldap_connect with two parameters

ldap_connect should be called with an LDAP-URI as parameter and not with
2 parameters as that allows much more flexibility like differentiating
between ldap and ldaps or setting multiple ldap-servers.

This change requires one to add null as second parameter in case the
underlying library is Oracle and one wants to add wallet-details.

* Modify all ldap-tests to use ldap_connect right

All tests are using ldap_connect now with an URI and not with host and
port as two separarte parameters.

* Verify deprecation of ldap_connect w/h 2 params

This adds a test to verify that calling ldap_connect with 2 parameters
triggers a deprecation notice

* Remove empty test

`ldap_control_paged_result()` is removed as of PHP 8.0.0, so this test
needs to be removed as well.

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>
Co-authored-by: Tim Düsterhus <timwolla@googlemail.com>

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