Reduce test execution times by explicitly configure quasar package exclusions (#5161)

* Reduce test execution times by explicitly configure quasar package exclusions (using new quasar util extension introduced in Corda gradle plugins 5.0.1-SNAPSHOT).

* Remove SNAPSHOT from Corda gradle plugins version identifier.

* Incorporating PR review feedback from CR.

* Minor consolidation clean-up.

* Minor consolidation clean-up.

* Minor consolidation clean-up.

core/build.gradle

@@ -170,6 +170,35 @@ task smokeTest(type: Test) {
     classpath = sourceSets.smokeTest.runtimeClasspath
 }
 
+// quasar exclusions upon agent code instrumentation at run-time
+quasar {
+    excludePackages.addAll(
+            "antlr**",
+            "com.codahale**",
+            "com.fasterxml.**",
+            "com.github.benmanes.caffeine.**",
+            "com.google.**",
+            "com.lmax.**",
+            "com.zaxxer.**",
+            "net.bytebuddy**",
+            "io.github.classgraph**",
+            "io.netty*",
+            "liquibase**",
+            "net.i2p.crypto.**",
+            "nonapi.io.github.classgraph.**",
+            "org.apiguardian.**",
+            "org.bouncycastle**",
+            "org.codehaus.**",
+            "org.h2**",
+            "org.hibernate**",
+            "org.jboss.**",
+            "org.objenesis**",
+            "org.w3c.**",
+            "org.xml**",
+            "org.yaml**",
+            "rx**")
+}
+
 artifacts {
     testArtifacts testJar
 }