Description of problem:
To run ipa-client-install --request-cert successfully in anaconda chroot
workaround described in bug 1134497 must be used.

To remove the need for workaround:
a) anaconda installer must not bind-mount the DBus system bus socket into
chroot (bug 1271551)
b) ipa needs logic to detect this situation and behave according.
c) DBus daemon needs to move socket outside the bind-mounted file system.

As described in bug 1271551, comment 7  a) is not easy to do in anaconda.
Approach b) is nothing else than hiding the workaround from user inside
ipa-installer.