Modify config code generator to write JmxAttribute as static fields.

Make JmxAttribute fields static so that name of the attribute can be
referenced and used to read from JMX.

Change-Id: Ibf2afbdfd8ae78e6ca46025671128bc7256f78d9
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Merge "Modify config code generator to write JmxAttribute as static fields."