[c2m]: Minor corrections

- Use env variables to define username and password instead of code modification
- Proxy setting corrected

Issue-ID: DOC-756
Signed-off-by: Gergely Csatari <gergely.csatari@nokia.com>
Change-Id: I76a72fec8550ede3935081ecc4917a277d3ec919
1 file changed