KIKIMR-18220: Enrich token with groups from LDAP

Add ldap functions wrapper and separate in different files for compatibility with different OS.

Add user groups fetching from ldap server.

Limitations:
- Fixed 'memberOf' attribute
- No tests to check how filter for search created
- Fetched groups are returned in event as is.

1 files changed, 47 insertions, 0 deletions

diff --git a/contrib/libs/openldap/LICENSE b/contrib/libs/openldap/LICENSE
new file mode 100644
index 0000000000..05ad7571e4
--- /dev/null
+++ b/contrib/libs/openldap/LICENSE
@@ -0,0 +1,47 @@
+The OpenLDAP Public License
+  Version 2.8, 17 August 2003
+
+Redistribution and use of this software and associated documentation
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+3. Redistributions must contain a verbatim copy of this document.
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