parser: don't use generalized specific byte sequence searches
parser: don't use generalized specific byte sequence searches

It's messy and the only two times its used is during initialization, so just replace it with context-specific solutions

jskirst/sftp-to-http,ArielAbreu/ssh2,24hr/ssh2,ArielAbreu/ssh2,mcanthony/ssh2,mscdex/ssh2,mscdex/ssh2,Student007/ssh2,Drooids/ssh2,mscdex/ssh2,mafintosh/ssh2,Student007/ssh2,mcanthony/ssh2,Drooids/ssh2,onilabs/ssh2,mafintosh/ssh2,24hr/ssh2,onilabs/ssh2,mafintosh/ssh2,ianscrivener/ssh2,ianscrivener/ssh2,mscdex/ssh2,jskirst/sftp-to-http