bfd: schema: replace xsd:sequence with xsd:any in conf entry

Config elements should be stored as xsd:any, because their ordering doesn't
matter and unspecified entries will be assigned default values.

Change-Id: Ib4f8e7ec6fe049f16b93826dfe08280e4357229e
Signed-off-by: Mateusz Zalega <mateusz.zalega@codilime.com>
Merge "bfd: schema: replace xsd:sequence with xsd:any in conf entry"