Fixes #6544 - qpid-cpp-client-dev pkg & qpidc.xml

* installs the qpid-client-devel package

* creates qpidc.xml so that cpp clients can connect without environment
    variables set
split install and config into own classes
Merge pull request #8 from dustint-rh/qpidcpp_messaging_api

Fixes #6544 - qpid-cpp-client-dev pkg & qpidc.xml