[MINOR][BUILD] Add ECCN notice required by http://www.apache.org/dev/crypto.html

Add ECCN notice required by http://www.apache.org/dev/crypto.html
See https://issues.apache.org/jira/browse/LEGAL-398

This should probably be backported to 2.3, 2.2, as that's when the key dep (commons crypto) turned up. BC is actually unused, but still there.

N/A

Closes #22064 from srowen/ECCN.

Authored-by: Sean Owen <[email protected]>
Signed-off-by: Sean Owen <[email protected]>
(cherry picked from commit 91cdab5)
Signed-off-by: Sean Owen <[email protected]>

Author: srowen

NOTICE

@@ -5,6 +5,31 @@ This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
 
 
+Export Control Notice
+---------------------
+
+This distribution includes cryptographic software. The country in which you currently reside may have
+restrictions on the import, possession, use, and/or re-export to another country, of encryption software.
+BEFORE using any encryption software, please check your country's laws, regulations and policies concerning
+the import, possession, or use, and re-export of encryption software, to see if this is permitted. See
+<http://www.wassenaar.org/> for more information.
+
+The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this
+software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software
+using or performing cryptographic functions with asymmetric algorithms. The form and manner of this Apache
+Software Foundation distribution makes it eligible for export under the License Exception ENC Technology
+Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for
+both object code and source code.
+
+The following provides more details on the included cryptographic software:
+
+This software uses Apache Commons Crypto (https://commons.apache.org/proper/commons-crypto/) to
+support authentication, and encryption and decryption of data sent across the network between
+services.
+
+This software includes Bouncy Castle (http://bouncycastle.org/) to support the jets3t library.
+
+
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 Common Development and Distribution License 1.0
 ========================================================================