Merge remote-tracking branch 'ritikRepo/add-unit-tests-redshift' into add-unit-tests-redshift

# Conflicts:
#	athena-redshift/src/test/java/com/amazonaws/athena/connectors/redshift/RedshiftEnvironmentPropertiesTest.java
#	athena-redshift/src/test/java/com/amazonaws/athena/connectors/redshift/RedshiftMetadataHandlerTest.java
#	athena-redshift/src/test/java/com/amazonaws/athena/connectors/redshift/RedshiftMuxMetadataHandlerTest.java
#	athena-redshift/src/test/java/com/amazonaws/athena/connectors/redshift/RedshiftMuxRecordHandlerTest.java
#	athena-redshift/src/test/java/com/amazonaws/athena/connectors/redshift/RedshiftRecordHandlerTest.java

Author: Trianz-Akshay