VcsBase: Remove some ssh related methods

Remove VcsCommand::m_sshPrompt, as it is always taken
from settings.

Change-Id: I9f46bb5a9de03e907f2098ca72a647c969e55a27
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/vcsbase/vcscommand.h

@@ -60,7 +60,6 @@ private:
     void emitRepositoryChanged(const Utils::FilePath &workingDirectory);
 
     QPointer<Core::FutureProgress> m_progress;
-    QString m_sshPrompt;
     bool m_preventRepositoryChanged;
 };