tests: remove real SSH (#4200)

* tests: remove real SSH

No longer needed, all tests are using mocked ssh already.

* travis: don't setup ssh

scripts/ci/before_install.sh

@@ -16,21 +16,6 @@ fi
 echo >env.sh
 
 if [[ "$TRAVIS_BUILD_STAGE_NAME" == "test" ]]; then
-  if [[ "$TRAVIS_OS_NAME" != "windows" ]]; then
-    # NOTE: ssh keys for ssh test to be able to ssh to the localhost
-    ssh-keygen -t rsa -N "" -f mykey
-    mkdir -p ~/.ssh
-    cp mykey ~/.ssh/id_rsa
-    cp mykey.pub ~/.ssh/id_rsa.pub
-    cat mykey.pub >>~/.ssh/authorized_keys
-    ssh-keyscan localhost >>~/.ssh/known_hosts
-    ssh localhost ls &>/dev/null
-    ssh-keyscan 127.0.0.1 >>~/.ssh/known_hosts
-    ssh 127.0.0.1 ls &>/dev/null
-    ssh-keyscan 0.0.0.0 >>~/.ssh/known_hosts
-    ssh 0.0.0.0 ls &>/dev/null
-  fi
-
   if [[ "$TRAVIS_OS_NAME" == "osx" && "$TRAVIS_PULL_REQUEST" == "false" ]]; then
     brew install openssl
     $scriptdir/retry.sh brew cask install google-cloud-sdk

tests/remotes/__init__.py

@@ -29,7 +29,6 @@ from .gs import (  # noqa: F401; noqa: F401
     gs,
 )
 from .ssh import (  # noqa: F401; noqa: F401
-    SSH,
     SSHMocked,
     ssh,
     ssh_connection,

tests/remotes/ssh.py

@@ -1,14 +1,11 @@
-import getpass
 import locale
 import os
 from contextlib import contextmanager
-from subprocess import CalledProcessError, check_output
 
 import pytest
 from funcy import cached_property
 
 from dvc.path_info import URLInfo
-from dvc.utils import env2bool
 
 from .base import Base
 from .local import Local
@@ -19,31 +16,6 @@ TEST_SSH_KEY_PATH = os.path.join(
 )
 
 
-class SSH:
-    @staticmethod
-    def should_test():
-        do_test = env2bool("DVC_TEST_SSH", undefined=None)
-        if do_test is not None:
-            return do_test
-
-        # FIXME: enable on windows
-        if os.name == "nt":
-            return False
-
-        try:
-            check_output(["ssh", "-o", "BatchMode=yes", "127.0.0.1", "ls"])
-        except (CalledProcessError, OSError):
-            return False
-
-        return True
-
-    @staticmethod
-    def get_url():
-        return "ssh://{}@127.0.0.1:22{}".format(
-            getpass.getuser(), Local.get_storagepath()
-        )
-
-
 class SSHMocked(Base, URLInfo):
     @staticmethod
     def get_url(user, port):  # pylint: disable=arguments-differ