pom.xml: updates for release 0.12.3
pom.xml: updates for release 0.12.3

Add new PLUGIN_CONFIG_ TenantKey
Expose paymentMethodId in buildFormDescriptor

Signed-off-by: stephane brossier <36bd4f73be32ed7262c164e7ee72163e7543989e@ning.com>

maguero/killbill-api,maguero/killbill-api,killbill/killbill-api,killbill/killbill-api