export support for chrome

test.diff

diff --git a/airgun/browser.py b/airgun/browser.py
index 055d2a3..a2f0ca0 100644
--- a/airgun/browser.py
+++ b/airgun/browser.py
@@ -165,6 +165,11 @@ class SeleniumBrowserFactory(object):
         if self.browser == 'chrome':
             if binary:
                 kwargs.update({'executable_path': binary})
+            options = webdriver.ChromeOptions()
+            prefs = {
+                'profile.default_content_setting_values.automatic_downloads': 1}
+            options.add_experimental_option("prefs", prefs)
+            kwargs.update({'chrome_options': options})
             self._webdriver = webdriver.Chrome(**kwargs)
         elif self.browser == 'firefox':
             if binary:
diff --git a/airgun/entities/contenthost.py b/airgun/entities/contenthost.py
index 7b67dec..354170a 100644
--- a/airgun/entities/contenthost.py
+++ b/airgun/entities/contenthost.py
@@ -79,6 +79,10 @@ class ContentHostEntity(BaseEntity):
         view.errata.search(errata_id)
         return view.errata.table.read()

+    def export(self):
+        view = self.navigate_to(self, 'All')
+        view.export.click()
+

 @navigator.register(ContentHostEntity, 'All')
 class ShowAllContentHosts(NavigateStep):

test.py

def test_foo(session):
    with session:
        SAVE_PATH = '/users/andrii/Downloads/'
        FILENAME = 'hosts-2018-08-22.csv'
        CSV_FILE = '{}{}'.format(SAVE_PATH, FILENAME)
        session.organization.select('gHWnJz')
        session.contenthost.export()
        assert os.path.isfile(CSV_FILE)
        with open(CSV_FILE, newline='') as csvfile:
            reader = csv.DictReader(csvfile)
            for row in reader:
                # not to expose internal URLs
                assert row['Name'].endswith('.redhat.com')

test_results.txt

pytest -v tests/foreman/ui_airgun/test_activationkey.py -k test_foo
============================= test session starts ==============================
platform darwin -- Python 3.6.4, pytest-3.4.0, py-1.5.3, pluggy-0.6.0 -- /Users/andrii/workspace/py3a/bin/python3.6
cachedir: .pytest_cache
shared_function enabled - OFF - scope:  - storage: file
rootdir: /Users/andrii/workspace/robottelo, inifile:
plugins: wait-for-1.0.9, xdist-1.22.0, services-1.2.1, mock-1.6.3, forked-0.2, env-0.6.2
collected 26 items
2018-08-22 18:59:48 - conftest - DEBUG - BZ deselect is disabled in settings


tests/foreman/ui_airgun/test_activationkey.py::test_foo PASSED           [100%]

============================= 25 tests deselected ==============================
=================== 1 passed, 25 deselected in 47.52 seconds ===================