Add integration tests for default launch script

This commit adds a suit of integration tests for the launch script. See
the accompanying README.adoc for further details.

Closes gh-4872

spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/conf/CentOS/5.11/Dockerfile

@@ -0,0 +1,11 @@
+FROM centos:5.11
+RUN yum install -y wget && \
+    yum install -y system-config-services && \
+    yum install -y curl && \
+    wget --no-cookies \
+        --no-check-certificate \
+        --header  "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" \
+        --output-document jdk.rpm \
+        http://download.oracle.com/otn-pub/java/jdk/8u66-b17/jdk-8u66-linux-x64.rpm && \
+    yum --nogpg localinstall -y jdk.rpm && \
+    rm -f jdk.rpm

spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/conf/CentOS/6.7/Dockerfile

@@ -0,0 +1,11 @@
+FROM centos:6.7
+RUN yum install -y wget && \
+    yum install -y system-config-services && \
+    yum install -y curl && \
+    wget --no-cookies \
+        --no-check-certificate \
+        --header  "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" \
+        --output-document jdk.rpm \
+        http://download.oracle.com/otn-pub/java/jdk/8u66-b17/jdk-8u66-linux-x64.rpm && \
+    yum --nogpg localinstall -y jdk.rpm && \
+    rm -f jdk.rpm

spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/conf/Ubuntu/14.04.3/Dockerfile

@@ -0,0 +1,8 @@
+FROM ubuntu:14.04.3
+RUN apt-get install -y software-properties-common && \
+    add-apt-repository ppa:webupd8team/java -y && \
+    apt-get update && \
+    echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections && \
+    apt-get install -y oracle-java8-installer && \
+    apt-get install -y curl && \
+    apt-get clean