Remove GemFire

Fixes gh-768

buildSrc/src/main/groovy/build/GemFireServerPlugin.groovy

@@ -1,70 +0,0 @@
-package build;
-
-import org.gradle.api.plugins.JavaPlugin
-import org.gradle.api.tasks.bundling.Zip
-import org.gradle.api.DefaultTask
-import org.gradle.api.Plugin
-import org.gradle.api.Project
-import org.gradle.api.tasks.TaskAction
-
-public class GemFireServerPlugin implements Plugin<Project> {
-
-	@Override
-	public void apply(Project project) {
-		project.tasks.create('gemFireServer', GemFireServerTask)
-
-		project.tasks.integrationTest.doLast {
-			println 'Stopping GemFire Server...'
-			project.tasks.gemFireServer.process?.destroyForcibly()
-		}
-
-		project.tasks.prepareAppServerForIntegrationTests {
-			dependsOn project.tasks.gemFireServer
-			doFirst {
-				project.gretty {
-					jvmArgs = ["-Dspring.session.data.gemfire.port=${project.tasks.gemFireServer.port}"]
-				}
-			}
-		}
-	}
-
-	static int availablePort() {
-		new ServerSocket(0).withCloseable { socket ->
-			socket.localPort
-		}
-	}
-
-	static class GemFireServerTask extends DefaultTask {
-		def mainClassName = "sample.ServerConfig"
-		def process
-		def port
-		boolean debug
-
-		@TaskAction
-		def greet() {
-			port = availablePort()
-			println "Starting GemFire Server on port [$port]..."
-	
-			def out = debug ? System.out : new StringBuilder()
-			def err = debug ? System.out : new StringBuilder()
-	
-			String classpath = project.sourceSets.main.runtimeClasspath.collect { it }.join(File.pathSeparator)
-			String gemfireLogLevel = System.getProperty('spring.session.data.gemfire.log-level', 'warning')
-
-			String[] commandLine = [
-				'java', '-server', '-ea', '-classpath', classpath,
-				//"-Dgemfire.log-file=gemfire-server.log",
-				//"-Dgemfire.log-level=config",
-				"-Dspring.session.data.gemfire.log-level=" + gemfireLogLevel,
-				"-Dspring.session.data.gemfire.port=${port}",
-				'sample.ServerConfig'
-			]
-	
-			//println commandLine
-			
-			project.tasks.appRun.ext.process = process = commandLine.execute()
-
-			process.consumeProcessOutput(out, err)
-		}
-	}
-}

buildSrc/src/main/resources/META-INF/gradle-plugins/gemfire-server.properties

@@ -1 +0,0 @@
-implementation-class=build.GemFireServerPlugin