This avoids very-long test and false positives when using some
auto-pubkey authentication from picking up default keys, which are available in
bob's home directory when we want to test the certificate authentication.
The separate file is also needed because once we change to bob's UID, we can not
simply go back different UID and this sounds cleaner than setting up SSH_DIR to
different users ...
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>
