tree 213c345abdf34379780adf56d864d97f401b1179
parent 034c188722719426073ca369bc2c04def4888a5e
author Alexander Afanasyev <alexander.afanasyev@ucla.edu> 1466713374 -0700
committer Alexander Afanasyev <alexander.afanasyev@ucla.edu> 1467228559 -0700

face+security: Introduce environment variables to set/override transport, pib, and tpm configurations.

- NDN_CLIENT_TRANSPORT: equivalent of transport in client.conf
- NDN_CLIENT_PIB: equivalent of pib in client.conf
- NDN_CLIENT_TPM: equivalent of tpm in client.conf

Whenever an environment variable is set, it takes precedence over any
values specified in the configuration file.

Change-Id: I44c2347168616387a0489b6bf5c2c3a12db29863
Refs: #2925, #2514