Add HTTPS entries for XSD into spring.schemas

Related to spring-projects/spring-integration#2987

**Cherry-pick to 2.1.x, 2.0.x & 1.7.x**

Author: artembilan

spring-rabbit/src/main/resources/META-INF/spring.schemas

@@ -1,2 +1,4 @@
 http\://www.springframework.org/schema/rabbit/spring-rabbit-2.1.xsd=org/springframework/amqp/rabbit/config/spring-rabbit-2.1.xsd
 http\://www.springframework.org/schema/rabbit/spring-rabbit.xsd=org/springframework/amqp/rabbit/config/spring-rabbit-2.1.xsd
+https\://www.springframework.org/schema/rabbit/spring-rabbit-2.1.xsd=org/springframework/amqp/rabbit/config/spring-rabbit-2.1.xsd
+https\://www.springframework.org/schema/rabbit/spring-rabbit.xsd=org/springframework/amqp/rabbit/config/spring-rabbit-2.1.xsd