first part of servicePath to mongo backend functions
ServicePath is now recovered from HTTP header and sent to underlying mongo update/query functions
tenant and servicePath defaults to empty string for mongoUpdateContext
Implemented query with isPattern=true and ServicePath and with a first working unit test
ServicePath working a little ... for queryContext: with EntityId:id as isPattern=true, and something done for updateContext also
just some cleanup
fixed the unit test
fixes during PR
More stuff for PR-review
Merge pull request #403 from telefonicaid/task/392_servicePath_http_params

Task/392 service path http params