[NO ISSUE][LIC] Add missing license files

 - user model changes: no
 - storage format changes: no
 - interface changes: no

Change-Id: I647641f6044c1edf1477049be2ced1b697a404c1
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/16243
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Michael Blow <mblow@apache.org>

asterixdb/src/main/licenses/content/bitbucket.org_connect2id_nimbus-jose-jwt_raw_50ae2a39a4a6d0dcbf05572af8a581377174ac96_COPYRIGHT.txt

@@ -0,0 +1,14 @@
+Nimbus JOSE + JWT
+
+Copyright 2012 - 2020, Connect2id Ltd.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at
+
+   https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.

asterixdb/src/main/licenses/content/raw.githubusercontent.com_netty_netty-tcnative_netty-tcnative-parent-2.0.46.Final_NOTICE.txt

@@ -0,0 +1,51 @@
+                          The Netty Project
+                            =================
+
+Please visit the Netty web site for more information:
+
+  * http://netty.io/
+
+Copyright 2016 The Netty Project
+
+The Netty Project licenses this file to you under the Apache License,
+version 2.0 (the "License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at:
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+License for the specific language governing permissions and limitations
+under the License.
+
+-------------------------------------------------------------------------------
+This product contains a forked and modified version of Tomcat Native
+
+  * LICENSE:
+    * license/LICENSE.tomcat-native.txt (Apache License 2.0)
+  * HOMEPAGE:
+    * http://tomcat.apache.org/native-doc/
+    * https://svn.apache.org/repos/asf/tomcat/native/
+
+This product contains the Maven wrapper scripts from 'Maven Wrapper', that provides an easy way to ensure a user has everything necessary to run the Maven build.
+
+  * LICENSE:
+    * license/LICENSE.mvn-wrapper.txt (Apache License 2.0)
+  * HOMEPAGE:
+    * https://github.com/takari/maven-wrapper
+
+This product contains small piece of code to support AIX, taken from netbsd.
+
+  * LICENSE:
+    * license/LICENSE.aix-netbsd.txt (OpenSSL License)
+  * HOMEPAGE:
+    * https://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/crypto/external/bsd/openssl/dist
+
+
+This product contains code from boringssl.
+
+  * LICENSE (Combination ISC and OpenSSL license)
+    * license/LICENSE.boringssl.txt (Combination ISC and OpenSSL license)
+  * HOMEPAGE:
+    * https://boringssl.googlesource.com/boringssl/