[AutoQA] #359: pretty_log: escape HTML entities

[fedora-badges]

#359: pretty_log: escape HTML entities
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 Reporter:  kparal  |       Owner:             
     Type:  defect  |      Status:  new        
 Priority:  major   |   Milestone:  Finger Food
Component:  core    |    Keywords:             
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 Currently we copy all test output into the PrettyLog verbatim. It also
 applies for summary, ID, highlights and pretty much everything. But if
 some of that text contains HTML entities, it creates invalid HTML page and
 breaks the report (different browsers may display it differently).
 Example: Try populating test summary with word '<undefined>'. The browser
 will consider it an unknown tag and don't display it at all.

 We need to escape all text we take over before putting it into HTML log.

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Ticket URL: <https://fedorahosted.org/autoqa/ticket/359>
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