Increase the robustness of Selenium workflow management tests.

Next Selenium build encountered a few different problems with importing workflows from URL:

- https://jenkins.galaxyproject.org/job/selenium/213/artifact/213-test-errors/test_rename2017090515241504639495/stacktrace.txt
- https://jenkins.galaxyproject.org/job/selenium/213/artifact/213-test-errors/test_view2017090515251504639548/
- https://jenkins.galaxyproject.org/job/selenium/213/artifact/213-test-errors/test_build_workflow2017090515191504639167/stacktrace.txt

On full test retry, only one of these actually caused a test error but we shouldn't have to depend on the test re-running stuff.

test/galaxy_selenium/navigates_galaxy.py

@@ -423,6 +423,11 @@ class NavigatesGalaxy(HasDriver):
         search_element.click()
         return search_element
 
+    @retry_during_transitions
+    def workflow_index_click_import(self):
+        element = self.wait_for_selector_clickable(self.test_data["selectors"]["workflows"]["import_button"])
+        element.click()
+
     def workflow_index_rename(self, new_name, workflow_index=0):
         self.workflow_index_click_option("Rename", workflow_index=workflow_index)
         alert = self.driver.switch_to.alert
@@ -459,6 +464,12 @@ class NavigatesGalaxy(HasDriver):
             tags.append(tag_span.text)
         return tags
 
+    def workflow_import_submit_url(self, url):
+        form_element = self.wait_for_selector_visible("#center form")
+        url_element = form_element.find_element_by_css_selector("input[type='text']")
+        url_element.send_keys(url)
+        self.click_submit(form_element)
+
     def workflow_sharing_click_publish(self):
         button = self.wait_for_selector_clickable("input[name='make_accessible_and_publish']")
         button.click()
@@ -507,6 +518,7 @@ class NavigatesGalaxy(HasDriver):
     def click_masthead_workflow(self):
         self.click_xpath(self.navigation_data["selectors"]["masthead"]["workflow"])
 
+    @retry_during_transitions
     def click_button_new_workflow(self):
         element = self.wait_for_selector_clickable(self.navigation_data["selectors"]["workflows"]["new_button"])
         element.click()

test/selenium_tests/test_workflow_management.py

@@ -112,10 +112,6 @@ class WorkflowManagementTestCase(SeleniumTestCase):
         self.assertEqual(len(self.workflow_index_table_elements()), n)
 
     def _workflow_import_from_url(self):
-        element = self.wait_for_selector_clickable(self.test_data["selectors"]["workflows"]["import_button"])
-        element.click()
+        self.workflow_index_click_import()
         url = "https://raw.githubusercontent.com/galaxyproject/galaxy/dev/test/base/data/test_workflow_1.ga"
-        form_element = self.driver.find_element_by_css_selector("#center form")
-        url_element = form_element.find_element_by_css_selector("input[type='text']")
-        url_element.send_keys(url)
-        self.click_submit(form_element)
+        self.workflow_import_submit_url(url)