The paste file now lives in /usr/share, and shouldn't be
modified. Configure the keystone auth token settings in
trove.conf instead.
Change-Id: Ib2cc2211cc645ad71e9f57c1c52177074472afcb
Since the parameters are used on other class, it's smarter to have them
on init class to just reuse them.
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>