Add anonymous_group_search to ldap_auth_backend

[stephenrjohnson]

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Relates OR Closes #0000

Release note for CHANGELOG:

Add missing argument to anonymous_group_search ldap_auth_backend

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[hashicorp-cla]

All committers have signed the CLA.

[stephenrjohnson]

Please note I'm not a go coder, I've no idea how terraform works under the hood and this is a total guess on how to add the argument. This relates to https://github.com/hashicorp/terraform-provider-vault/issues/1349