Upgrade to Reactor 3.2 M4, R-Netty- 0.8 M2

Revert AMQP upgrade

https://build.spring.io/browse/INT-MASTER-1158/

Author: artembilan

build.gradle

@@ -126,12 +126,12 @@ subprojects { subproject ->
 		mysqlVersion = '8.0.11'
 		pahoMqttClientVersion = '1.2.0'
 		postgresVersion = '42.0.0'
-		reactorNettyVersion = '0.8.0.BUILD-SNAPSHOT'
-		reactorVersion = '3.2.0.BUILD-SNAPSHOT'
+		reactorNettyVersion = '0.8.0.M2'
+		reactorVersion = '3.2.0.M4'
 		romeToolsVersion = '1.9.0'
 		servletApiVersion = '4.0.0'
 		smackVersion = '4.2.3'
-		springAmqpVersion = project.hasProperty('springAmqpVersion') ? project.springAmqpVersion : '2.1.0.RC2'
+		springAmqpVersion = project.hasProperty('springAmqpVersion') ? project.springAmqpVersion : '2.1.0.BUILD-SNAPSHOT'
 		springDataJpaVersion = '2.1.0.RC2'
 		springDataMongoVersion = '2.1.0.RC2'
 		springDataRedisVersion = '2.1.0.RC2'