Add defininition of window.location.origin in both CMS/LMS

The same bug in studio was fixed in #3893, and as TinyMCE is also used in LMS, it should be also fixed in LMS.
Here a common javascript file called 'ie_shim.js' is added, so that in the future it can be used for other IE compatibility purposes too.
Refactor studio tests to use StudioCourseTest
Use clear and send_keys instead of action chains in page object methods
removing syslog_addr

This is not currently being used in production and will not
be used moving forward since logs are remoted using splunk
Merge pull request #4558 from edx/jarv/remove-syslog-addr

removing syslog_addr
Merge pull request #4548 from edx/benmcmorran/refactor-studio-tests

Refactor studio tests to use StudioCourseTest
Merge pull request #4557 from edx/zoldak/remove-action-chains

Use clear and send_keys instead of action chains in page object methods
Merge pull request #4392 from louyihua/lms-window-origin

Add defininition of window.location.origin in both studio and LMS
BLD-1104: List units that use group configuration.
REVERT THIS COMMIT BEFORE MERGE.
Addressed comments.
Added Anton's fixes from other branch.
Addressed styling comment.