Use proxyURL to log into sandbox using Red Hat auth token

[dgolovin]

Getting resources seems to work fine through the proxy, but there are two problems to solve:

1. idToken lives 900 seconds and then have to be refreshed in kubeconfig (that probably affects live connections through the proxy that already exists at the moment when refresh happens)
2. odo dev cannot sync files through the proxy

Fix #2519.

Signed-off-by: Denis Golovin [email protected]