Wrong user creation

[denics]

Requirements

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Description of the Change

In debian based systems creating user solr with shell in /bin/false does not work. With this patch I propose to add a variable solr_user_shell to solve the issue, following the discussion in https://www.mail-archive.com/[email protected]/msg128029.html

Benefits

Admin can choose which shell assign to solr

Possible Drawbacks

Security? But not according to documentation

Applicable Issues

idealista#68