Ensured non-enpty value for "SessionCookieDomains" system setting on installation

Part 1

1. start clean install
2. confirm, that on "Select Domain" step current domain is pre-selected
3. finish installation
4. login to the adm.console, go to the Configuration → Website → Advanced section
5. confirm, that "Session Cookie Domains..." variable has hint "The Front-End Login form will be broken unless this setting is populated."
6. confirm, that label for "CookieSessions" variable is "Session Management Method (for Front-End only)"

Part 2

1. start upgrade
2. ensure, that in the old database version, in the SystemSettings table, SessionCookieDomains variable has empty value
3. ensure, that in the system/config.php “$_CONFIG['Misc']['Domain']” setting has non-empty value
4. finish upgrade
5. login to the adm.console, go to the Configuration → Website → Advanced section
6. confirm, that "Session Cookie Domains..." variable has value from “$_CONFIG['Misc']['Domain']” setting
7. confirm, that "Session Cookie Domains..." variable has hint "The Front-End Login form will be broken unless this setting is populated."
8. confirm, that label for "CookieSessions" variable is "Session Management Method (for Front-End only)"