first step toward using standard MPConfig property names

[njr-11]

In order to align with standards being defined for MicroProfile specs that define their own MicroProfile Config properties, we need to change the name of 7 properties that MicroProfile Context Propagation uses to supply default values for ManagedExecutor/ThreadContext instances. Per eclipse/microprofile#100 these property names should be prefixed with mp.[spec-name]. and per eclipse/microprofile-config#420 these property names should avoid the use of /.

This pull will make OpenLiberty tolerate either form of the property names for now. Then, once the spec changes goes through, we can remove support for the old names.

[njr-11]

#build

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