[Bro-Dev] [JIRA] (BIT-1047) Delete old scripts before installing new ones

[Robin Sommer (JIRA)]

Robin Sommer created BIT-1047:
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             Summary: Delete old scripts before installing new ones
                 Key: BIT-1047
                 URL: https://bro-tracker.atlassian.net/browse/BIT-1047
             Project: Bro Issue Tracker
          Issue Type: Improvement
          Components: Bro
            Reporter: Robin Sommer
             Fix For: 2.2


People keep having problems when they install a new Bro version 
over the installation of an old one because scripts that have disappeared in the new version will keep sticking around from the previous installation. 

We should simply remove the old scripts/base and scripts/policy before installing anything new. People aren't supposed to edit in there so that should be safe.

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