MAMA: Enable playback parser to create payload from file.
MAMA: Enable playback parser to create payload from file.

Currently the playback parser always creates payloads using the default
payload rather than the payload contained in the playback file. This
change enables support for reading it from the file.

[OMAMA-283]

Signed-off-by: A Ambrose <adf778e8f047b26f3e0544674b3bfe8e328348f7@nyx.com>

MattMulhern/OpenMAMA,vulcanft/openmama,MattMulhern/OpenMAMA,fquinner/OpenMAMA,cloudsmith-io/openmama,vulcanft/openmama,dpauls/OpenMAMA,cloudsmith-io/openmama,kuangtu/OpenMAMA,kuangtu/OpenMAMA,vulcanft/openmama,dpauls/OpenMAMA,kuangtu/OpenMAMA,philippreston/OpenMAMA,fquinner/OpenMAMA,philippreston/OpenMAMA,kuangtu/OpenMAMA,MattMulhern/OpenMAMA,dpauls/OpenMAMA,cloudsmith-io/openmama,kuangtu/OpenMAMA,fquinner/OpenMAMA,MattMulhern/OpenMAMA,dpauls/OpenMAMA,philippreston/OpenMAMA,MattMulhern/OpenMAMA,MattMulhern/OpenMAMA,fquinner/OpenMAMA,kuangtu/OpenMAMA,cloudsmith-io/openmama,philippreston/OpenMAMA,cloudsmith-io/openmama,vulcanft/openmama,fquinner/OpenMAMA,vulcanft/openmama,vulcanft/openmama,dpauls/OpenMAMA,philippreston/OpenMAMA,dpauls/OpenMAMA,fquinner/OpenMAMA,philippreston/OpenMAMA,philippreston/OpenMAMA,MattMulhern/OpenMAMA,fquinner/OpenMAMA,vulcanft/openmama,cloudsmith-io/openmama,cloudsmith-io/openmama,kuangtu/OpenMAMA,dpauls/OpenMAMA