Eliminate Redundant Fetches in RSS Controller

[bsuryadevara]

Description

Addressed redundant feed fetches in the RSS Controller when parsing manually with BeautifulSoup and cache is enabled.

Closes #1419

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[mdemoret-nv]

/ok to test

[mdemoret-nv]

Looking over the changes, I'm getting the feeling that the RSS Controller is getting a bit confusing. Lets refactor the class so the steps are clear and we dont need to check whether we are using a cache or if its a URL so often.

For each item in the input list:

1. Call a function to turn the input item into text
   1. If this is a file, read the file from disk into a string
   2. If this is a URL, use the session to download the text from the URL
      1. It should not be required at this stage to check whether or not the cache is enabled
2. With the returned text, try to parse it with feedparser
3. If feedparser fails, try to parse with BeautifulSoup

That should be the only steps necessary to process the feed and should clean up the code a bit.

[bsuryadevara]

/ok to test

[bsuryadevara]

/ok to test

[bsuryadevara]

/ok to test

[mdemoret-nv]

/ok to test

[mdemoret-nv]

Thanks for adding the test

[mdemoret-nv]

/merge