[NO ISSUE] Always build with jdk target 8

Change-Id: I2f31adc13ce24c1a631620612259b774ab88fa0b
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3531
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Murtadha Hubail <mhubail@apache.org>
diff --git a/asterixdb/pom.xml b/asterixdb/pom.xml
index 0149810..9a8cf32 100644
--- a/asterixdb/pom.xml
+++ b/asterixdb/pom.xml
@@ -547,7 +547,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-plugin-plugin</artifactId>
-          <version>3.5.2</version>
+          <version>3.6.0</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
@@ -808,41 +808,13 @@
     <profile>
       <id>java8</id>
       <activation>
-        <jdk>1.8</jdk>
+        <jdk>[1.8,)</jdk>
       </activation>
       <properties>
         <target.jdk.version>8</target.jdk.version>
       </properties>
     </profile>
     <profile>
-      <id>java9</id>
-      <activation>
-        <jdk>9</jdk>
-      </activation>
-      <properties>
-        <target.jdk.version>9</target.jdk.version>
-      </properties>
-    </profile>
-    <profile>
-      <id>java10</id>
-      <activation>
-        <jdk>10</jdk>
-      </activation>
-      <properties>
-        <target.jdk.version>10</target.jdk.version>
-      </properties>
-    </profile>
-    <profile>
-      <id>java11</id>
-      <activation>
-        <jdk>11</jdk>
-      </activation>
-      <properties>
-        <!-- several plugins do not yet support Java 11 classes (maven-plugin-plugin, maven-dependency-plugin) -->
-        <target.jdk.version>10</target.jdk.version>
-      </properties>
-    </profile>
-    <profile>
       <id>java8-bootclasspath</id>
       <activation>
         <property>
diff --git a/hyracks-fullstack/hyracks/pom.xml b/hyracks-fullstack/hyracks/pom.xml
index 5990526..c66c4fe 100644
--- a/hyracks-fullstack/hyracks/pom.xml
+++ b/hyracks-fullstack/hyracks/pom.xml
@@ -35,7 +35,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-plugin-plugin</artifactId>
-          <version>3.5.2</version>
+          <version>3.6.0</version>
         </plugin>
         <!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
         <plugin>
diff --git a/hyracks-fullstack/pom.xml b/hyracks-fullstack/pom.xml
index 565d29b..c619397 100644
--- a/hyracks-fullstack/pom.xml
+++ b/hyracks-fullstack/pom.xml
@@ -737,41 +737,13 @@
     <profile>
       <id>java8</id>
       <activation>
-        <jdk>1.8</jdk>
+        <jdk>[1.8,)</jdk>
       </activation>
       <properties>
         <target.jdk.version>8</target.jdk.version>
       </properties>
     </profile>
     <profile>
-      <id>java9</id>
-      <activation>
-        <jdk>9</jdk>
-      </activation>
-      <properties>
-        <target.jdk.version>9</target.jdk.version>
-      </properties>
-    </profile>
-    <profile>
-      <id>java10</id>
-      <activation>
-        <jdk>10</jdk>
-      </activation>
-      <properties>
-        <target.jdk.version>10</target.jdk.version>
-      </properties>
-    </profile>
-    <profile>
-      <id>java11</id>
-      <activation>
-        <jdk>11</jdk>
-      </activation>
-      <properties>
-        <!-- several plugins do not yet support Java 11 classes (maven-plugin-plugin, maven-dependency-plugin) -->
-        <target.jdk.version>10</target.jdk.version>
-      </properties>
-    </profile>
-    <profile>
       <id>java8-bootclasspath</id>
       <activation>
         <property>