ssh: increase terminal size to avoid issues with echoed command parsing

By default the terminal emulated by pxssh is 24x80 in size, which force
the addition of unwanted "\r" in long commands. These \r are painful to
parse and remove from the echoed command.

This patch tries to alleviate this issue by setting a bigger TTY terminal
by default. A 200 columns display should be big enough to execute most
of the commands. In case longer commands are required it is better
have them on a script to push on the target for execution.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>

devlib/utils/ssh.py

@@ -57,6 +57,9 @@ def ssh_get_shell(host, username, password=None, keyfile=None, port=None, timeou
             conn.login(host, username, password, port=port, login_timeout=timeout)
     except EOF:
         raise TargetError('Could not connect to {}; is the host name correct?'.format(host))
+    conn.setwinsize(500,200)
+    conn.sendline('')
+    conn.prompt()
     return conn