Support building Teiid with JDK 1.8.

One issue found is related to building "security", which throws the following error:

[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /home/jim/src/teiid/jboss-security/src/main/java/org/teiid/jboss/oauth/OAuth20CredentialImpl.java:[62,37] cannot access org.apache.cxf.endpoint.Retryable
class file for org.apache.cxf.endpoint.Retryable not found

A community user determined the following was needed to resolve it:

+ <dependency>
+ <groupId>org.apache.cxf</groupId>
+ <artifactId>cxf-api</artifactId>
+ <scope>provided</scope>
+ </dependency>