YARN-6902. Update Microsoft JDBC Driver for SQL Server version in License.txt. (Botong Huang via Subru).

LICENSE.txt

@@ -698,7 +698,7 @@ hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/static/jquery-1.10.2.min.js
 hadoop-tools/hadoop-sls/src/main/html/js/thirdparty/jquery.js
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/webapps/static/jquery
 Apache HBase - Server which contains JQuery minified javascript library version 1.8.3
-Microsoft SQLServer - JDBC version 6.1.0.jre7
+Microsoft JDBC Driver for SQLServer - version 6.2.1.jre7
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