merge propagation code of host parameters to the agents

[DaanHoogland]

propagating agent.properties from MS to agents from the MS has some boiler plate as commented by @nvazquez . we can put some effort in to unify the code used as specified in #3491 (review)

ISSUE TYPE

• Improvement Request

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CLOUDSTACK VERSION

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OS / ENVIRONMENT

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ACTUAL RESULTS

[yadvr]

@DaanHoogland was this addressed, can this be closed then? Thanks