register response start line may split by LF

[yushimeng]

Server may get sipVersion ends with LF if request start line ends with LF ranther than CRLF.
Although it's documented here. https://www.rfc-editor.org/rfc/rfc3261.html#section-7
If consider return err while startline ends with LF or CR ?
SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.10.8:60719;rport=60719;branch=z9hG4bK1377739937 From: <sip:34020000002000000719@3402000000>;tag=1534571172 To: <sip:34020000002000000719@3402000000>;tag=b70dda5e-f487-4b46-8e21-42b7c5dfcfa0 Call-ID: 1566767517 CSeq: 1 REGISTER Content-Length: 0

[emiago]

Hi @yushimeng Thx for contributing.
Here I see there was some old code (unreachable) here left. I would need revisit this, but I think you are right.
Could be some tests need to be updated as well.

[emiago]

Added fix. Pls check main branch

[emiago]

Considering this as fixed.