Fail to format existing btrfs partitions with Jessie installer

["Mocanu, Silviu" <johnyc20@gmail.com>]

Hello,

There is a bug in the installer for Jessie, related to formatting
existing partitions as btrfs.
If the partition already contain a fs( in my case the existing fs is
also btrfs ) installer is unable to format it.
On installer logs you can find the following error:
"""
Mar 19 05:26:57 partman: /dev/mapper/vg_d6-root01 appears to contain an
existing filesystem (btrfs).
Mar 19 05:26:57 partman: Error: Use the -f option to force overwrite.
"""

Thanks,
Silviu

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