config: improved updatehub credentials getter #33
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uhu config main object has now 2 main methods, get_credentials and
set_credentials, both used to get and set UpdateHub server access key
and access secret.
Config.get_credentials is able to get user credentials from
environment (with UHU_ACCESS_ID and UHU_ACCESS_SECRET variables) and
from ~/.uhu file. Environment variables are priorized. Also,
get_credentials raises an error if no credential is provided. This
helps clients to deal properly if users have not set its credentials.
With this modifications all config module dependents (updatehub, repl
and cli) were update to follow what is stated above.
Signed-off-by: Pablo Palácios ppalacios992@gmail.com