Cleanup: use read_char in read_until.
Cleanup: use read_char in read_until.

jussimalinen/SSHLibrary,junousia/SSHLibrary,haeygen/SSHLibrary,garybehrend/robotframework-sshlibrary,haeygen/SSHLibrary,junousia/SSHLibrary,jussimalinen/SSHLibrary,garybehrend/robotframework-sshlibrary