Merge setting up vaults into single microservice run of vaultmgr

[cshari-zededa]

From #314 Conversations:
@rvs:
Since you now turned vaultmgr into a microservice I'm wondering if there's a way to get rid of initialization on line 237 in device-steps.sh to make vaultmgr self-contained.

@cshari-zededa:
a) Folding the initialisation done on line 237 into vaultmgr microservice is not trivial, and needs a thought process on its own(and probably need a EVE proposal as well), may I address this in a separate PR?

-- Hence this issue.