Tomcat 7 Adapter rely on Code from 7.0.52

https://github.com/arquillian/arquillian-container-tomcat/blob/master/tomcat-embedded-7/src/main/java/org/jboss/arquillian/container/tomcat/embedded/EmbeddedHostConfig.java#L81

and

https://github.com/arquillian/arquillian-container-tomcat/blob/master/tomcat-embedded-7/src/main/java/org/jboss/arquillian/container/tomcat/embedded/Tomcat7EmbeddedContainer.java#L318

ContextHome(String, Boolean) is new in 7.0.52 but missing in previous versions.

Use reflection to check if (String, Boolean) exists, else fall back to (String).