[#334] Move common_steps*

Signed-off-by: Elizaveta Chichindaeva <elizaveta@nspcc.ru>

robot/resources/lib/python/cli_helpers.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python3.8
+
+"""
+Helper functions to use with `neofs-cli`, `neo-go`
+and other CLIs.
+"""
+
+import subprocess
+import pexpect
+
+from robot.api import logger
+
+ROBOT_AUTO_KEYWORDS = False
+
+
+def _cmd_run(cmd):
+    """
+    Runs given shell command <cmd>, in case of success returns its stdout,
+    in case of failure returns error message.
+    """
+    try:
+        compl_proc = subprocess.run(cmd, check=True, universal_newlines=True,
+                    stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=30,
+                    shell=True)
+        output = compl_proc.stdout
+        logger.info(f"Output: {output}")
+        return output
+    except subprocess.CalledProcessError as exc:
+        raise RuntimeError(f"Error:\nreturn code: {exc.returncode} "
+                f"\nOutput: {exc.output}") from exc
+
+def _run_with_passwd(cmd):
+    p = pexpect.spawn(cmd)
+    p.expect(".*")
+    p.sendline('\r')
+    p.wait()
+    cmd = p.read()
+    return cmd.decode()