Replace kotlinx-support-jdk8 with kotlin-stdlib-jre8. (#463)

* Replace kotlinx-support-jdk8 with kotlin-stdlib-jre8.
* Add kotlinVersion to constants.properties.

* Remove unused variable.

node/build.gradle

@@ -66,7 +66,7 @@ dependencies {
     compile "org.apache.logging.log4j:log4j-slf4j-impl:${log4j_version}"
     compile "org.apache.logging.log4j:log4j-web:${log4j_version}"
 
-    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
     compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
     testCompile "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
 

node/src/integration-test/kotlin/net/corda/services/messaging/P2PSecurityTest.kt

@@ -1,7 +1,6 @@
 package net.corda.services.messaging
 
 import com.google.common.util.concurrent.ListenableFuture
-import kotlinx.support.jdk7.use
 import net.corda.core.crypto.Party
 import net.corda.core.div
 import net.corda.core.getOrThrow

node/src/main/kotlin/net/corda/node/services/schema/HibernateObserver.kt

@@ -1,6 +1,5 @@
 package net.corda.node.services.schema
 
-import kotlinx.support.jdk7.use
 import net.corda.core.contracts.ContractState
 import net.corda.core.contracts.StateAndRef
 import net.corda.core.contracts.StateRef

node/src/main/kotlin/net/corda/node/services/statemachine/StateMachineManager.kt

@@ -9,7 +9,6 @@ import com.esotericsoftware.kryo.Kryo
 import com.esotericsoftware.kryo.pool.KryoPool
 import com.google.common.collect.HashMultimap
 import com.google.common.util.concurrent.ListenableFuture
-import kotlinx.support.jdk8.collections.removeIf
 import net.corda.core.ThreadBox
 import net.corda.core.bufferUntilSubscribed
 import net.corda.core.crypto.Party