Change the XML namespaces on the mediapackages to be compatible with OC-MH 1.4 about galicaster HOT 4 CLOSED

See OC-MH ticket http://opencast.jira.com/browse/MH-9256

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See the branch https://github.com/teltek/Galicaster/tree/dev_xml_namespaces

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OC-MH < 1.4 works with namespaces. Branch merged in master.

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Schedules: works on 1.2.2 from 1.2, 1.3 and 1.4
Ingest without using namespace to 1.2 & 1.3: OK
Ingest without using namespace to 1.4: fails, a erroneous MP appears

Ingest using namespace to 1.2 & 1.3:fails, a erronous MP appears
Ingest using namespace to 1.4: OK

Patched 1.4:
Works using namespace of not.

1.2.2 Galicaster local MP:
New ones will have namespace
Old ones will be updated once a operation (any) is performed.

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