SRAMP-544 SNAPSHOT artifacts can no longer be pulled from S-RAMP

https://issues.jboss.org/browse/SRAMP-544

Instructions to test:
If you want to test the fix it could be good to check the Sramp pulling using wagon and the Maven Repository Service:
Steps:

    Deploy s-ramp
    Go here: s-ramp/s-ramp-demos/s-ramp-demos-webapp-multimodule
    cd artifacts
    mvn clean deploy -Pdemo
    cd ..
    cd web
    Remove the s-ramp-demos-webapp-multimodule-artifacs content of your maven local repository to force maven do download from s-ramp.
    Test the pulling mechanism. It could be using:

        Wagon --> mvn clean install -Pdemo
        Maven Repository Service --> Include the maven repository and mvn clean install:

          <repositories>
            <repository>
              <id>local-sramp-maven-repo</id>
              <name>S-RAMP Releases Repository</name>
              <url>http://localhost:8080/s-ramp-server/maven/repository</url>
            </repository>
          </repositories>