[#1903] clean up database plugin and add copy of db type from server config singleton to icss
[#1903] clean up database plugin and add copy of db type from server config singleton to icss

janiheikkinen/irods,leesab/irods,PaulVanSchayck/irods,leesab/irods,PaulVanSchayck/irods,leesab/irods,janiheikkinen/irods,janiheikkinen/irods,leesab/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,janiheikkinen/irods,leesab/irods,PaulVanSchayck/irods,leesab/irods,PaulVanSchayck/irods,janiheikkinen/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods,janiheikkinen/irods,leesab/irods,janiheikkinen/irods,PaulVanSchayck/irods