SSDM-5398: implemented password reset mechanism for file authentication

...ch/systemsx/cisd/openbis/generic/server/CommonServer.java

...as/webapps/eln-lims/html/js/controllers/MainController.js

...lims/1/as/webapps/eln-lims/html/js/server/ServerFacade.js

...rsistentkeyvaluestore-source/PersistentKeyValueStore.java

...lugins/password-reset-api/lib/persistentkeyvaluestore.jar

...eporting-plugins/password-reset-api/password-reset-api.py

...ss/reporting-plugins/password-reset-api/plugin.properties