Fix login-logout-login sequence
Fix login-logout-login sequence

Patch submitted by Pawel Chomicki

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