Update to Gradle 3.4-rc-2

We need to explicitly apply Dependency Management to the root
project since it depends on modules that use dependency management.
We need to ensure dependency management is applied after propdeps-maven
to avoid an ordering issue [1]

An update to propdeps was necessary to be compatable with Gradle
3.4+

[1] https://github.com/spring-gradle-plugins/dependency-management-plugin/issues/149

Issue: SPR-15207

build.gradle

@@ -4,7 +4,7 @@ buildscript {
 		maven { url "https://repo.spring.io/plugins-snapshot" }
 	}
 	dependencies {
-		classpath("org.springframework.build.gradle:propdeps-plugin:0.0.7")
+		classpath("io.spring.gradle:propdeps-plugin:0.0.8")
 		classpath("org.asciidoctor:asciidoctor-gradle-plugin:1.5.3")
 		classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.0-beta-38")
 		classpath("io.spring.gradle:docbook-reference-plugin:0.3.1")
@@ -1250,10 +1250,21 @@ configure(rootProject) {
 	apply plugin: "org.asciidoctor.convert"
 	apply plugin: "docbook-reference"
 	apply plugin: "groovy"
+	apply plugin: "io.spring.dependency-management"
 
 	// apply plugin: "detect-split-packages"
 	apply from: "${gradleScriptDir}/jdiff.gradle"
 
+	dependencyManagement {
+		imports {
+			mavenBom "io.projectreactor:reactor-bom:${reactorVersion}"
+		}
+		resolutionStrategy {
+			cacheChangingModulesFor 0, 'seconds'
+		}
+		applyMavenExclusions = false
+	}
+
 	asciidoctor {
 		sourceDir project.file('src/asciidoc')
 		separateOutputDirs = false

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Jan 13 11:20:36 CET 2017
+#Wed Feb 08 08:27:32 CST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.4-rc-2-bin.zip