Key exchange types, set integer option values

Added key exchange types
Added function for setting integer option types
Added CI compressed session test (#101)

Author: pkittenis

Changelog.rst

@@ -10,6 +10,9 @@ Changes
 * Added private key file formats to `ssh.key` and `ssh.key.Key.export_privkey_file_format` for exporting private key
   file with specified format - #96
 * Added `ssh.channel.Channel.get_exit_status` implementation and tests.
+* Added key exchange types under `ssh.session`.
+* Added `ssh.session.Session.options_set_int_val` for setting an integer value `libssh` option - for example
+  compression level.
 
 
 Packaging

ci/integration_tests/test_session.py

@@ -205,3 +205,18 @@ def test_set_timeout(self):
     def test_get_server_publickey(self):
         self.session.connect()
         self.assertIsInstance(self.session.get_server_publickey(), SSHKey)
+
+    def test_compression_connect(self):
+        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        sock.connect((self.host, self.port))
+        session = Session()
+        session.options_set(options.USER, self.user)
+        session.options_set(options.HOST, self.host)
+        session.options_set_port(self.port)
+        # Great API, "yes" "no" as booleans
+        self.assertEqual(session.options_set(options.COMPRESSION, "yes"), 0)
+        self.assertEqual(session.options_set_int_val(options.COMPRESSION_LEVEL, 2), 0)
+        self.assertEqual(session.set_socket(sock), 0)
+        self.assertEqual(session.connect(), 0)
+        self.assertEqual(
+            session.userauth_publickey(self.pkey), 0)