This PR fixes many roles where loop: caused to evaluate only first element from oracle_databases / oracle_pdbs.
It also changes the match filter in probably all selectattr() calls as there exact match is needed, and match filter actually matches only beginning of the string/line thus creating a possibility to include also partial matches which would cause problems.
One last touch is change in oradb_facts role, as it used global fact variables and not those from registered variable, which (when using for example ignore_errors) might led to a situation where facts for one failed database would be set to those from previous loop element. It may never occur, yet this way it is just safer.