QtcProcess: Get rid of useTerminal

Remove SshRemoteProcessRunner::runInTerminal() method,
it wasn't used anywhere (just in test).
Remove QtcProcess::useTerminal, as process should be
created in TerminalOn mode when there is a need for terminal.
Add a parameter to
SshRemoteProcess::fullLocalCommandLine(bool inTerminal)
as this may still be needed when running application
through ssh from terminal (ssh -tt option).

Change-Id: I71911082fcca190b82a1106a2ca1ca48dc5d4c79
Reviewed-by: hjk <hjk@qt.io>
(cherry picked from commit 95a9b22f6f)

src/libs/utils/qtcprocess.h

@@ -115,9 +115,6 @@ public:
     void setDisableUnixTerminal();
     void setRunAsRoot(bool on);
 
-    void setUseTerminal(bool on);
-    bool useTerminal() const;
-
     void setAbortOnMetaChars(bool abort);
 
     void start();