Fix DMI host/port and clean up Postman collection

Currently, Postman collection does not work out-of-the-box,
due to DMI host being incorrect. DMI Plugin URL supplied to
NCMP inventory must be accessible from inside the docker network.
Using localhost does not work, as it will point to NCMP itself.

Issue-ID: CPS-2336
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I2870ef4dd966a26e5931c95ce74a2125dc857f16
2 files changed