Do not use input header for error responses

When parsing of the input header fails, it could be for a variety of
issues, including an overflow of the language tag length. We should not
utilize any v

Do not use input header for error responses

When parsing of the input header fails, it could be for a variety of
issues, including an overflow of the language tag length. We should not
utilize any variable aspects of the header in our response and
instead just send back a default of all 0's with the static fields set
along with error the code.

Utilize std::bitset to get the function ID properly written to
cout/cerr.

Tested:
- Verified when sending in an invalid header, it no longer can cause
unexpected error paths in parseHeader function

Change-Id: I17a8a013bcd90e083b1156f794f059fc1b830a63
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>

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