Use JDK instead of JRE in docker images

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 COPY start-tb-node.sh ${pkg.name}.deb /tmp/
 

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 RUN apt-get update
 RUN apt-get install -y curl nmap procps

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 RUN apt-get update
 RUN apt-get install -y postgresql postgresql-contrib

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 COPY logback.xml ${pkg.name}.conf start-db.sh stop-db.sh start-tb.sh upgrade-tb.sh install-tb.sh ${pkg.name}.deb /tmp/
 

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 COPY logback.xml ${pkg.name}.conf start-tb-coap-transport.sh ${pkg.name}.deb /tmp/
 

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 COPY logback.xml ${pkg.name}.conf start-tb-http-transport.sh ${pkg.name}.deb /tmp/
 

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-FROM openjdk:8-jre
+FROM openjdk:8-jdk
 
 COPY logback.xml ${pkg.name}.conf start-tb-mqtt-transport.sh ${pkg.name}.deb /tmp/