The SDKv2 conversion introduced a regression to do with setting
credentials with env_auth=true. The rclone documentation explicitly
states that env_auth only applies if secret_access_key and
access_key_id are blank and users had been relying on that.
However after the SDKv2 conversion we were ignoring static credentials
if env_auth=true.
This fixes the problem by ignoring env_auth=true if secret_access_key
and access_key_id are both provided. This brings rclone back into line
with the documentation and users expectations.
Fixes#8067
Nick Craig-Wood
2dcb327bc0