string freeze exception request for anaconda in F23

[Noriko Mizumoto]

The message sent from David.
------------------------------------
The string is in pyanaconda/errors.py:

"There is a problem with your existing storage configuration:
<b>%(errortxt)s</b>\n"
"\n"
"You must resolve this matter before the installation can proceed. There
is a shell available for use which you can access by pressing
ctrl-alt-f1 and then ctrl-b 2.\n"
"\n"
"Once you have resolved the issue you can retry the storage scan. If you
do not fix it you will have to exit the installer."

I want to change the first line to instead be:

"There is a problem with your existing storage configuration:
%(errortxt)s\n"

so the only change to the string is to remove the <b> and </b>
formatting tags.

The reason for this change is that this error message is used in both
graphical and text modes in anaconda, and text mode does not know what
to do with the formatting tags.

The bug to track this issue is
https://bugzilla.redhat.com/show_bug.cgi?id=1264981