add db restart option after spfile init parameter change

[bartowl]

This PR adds 2 features:

• possibility to automatically restart database(s) after applying change to init parameter scoped on spfile in order to make the changes effective
• enhances oracle_db module with state: restarted that restarts the database
  It additionally introduces some code cleanup and simplifications in oracle_db module.

[bartowl]

I had to move the sleep(10) to start_instance as otherwise if oradb_manage_parameters role has been followed by another that immediately tried to connect to the database, the database was not yet ready and playbook failed. Now every one start of the database will wait 10 seconds for the db to fully start and register in listener.

[Rendanic]

I did some test and 1 important point.
Oracle rounds some values in spfile to v$parameter.

Example:
SPFILE: sga_target = 1800M

v$parameter: sga_target = 1808M

I have no idea, how Oracle rounds the values.

We have to live with this effect for the moment...

Don't forget - this affects all memory parameter. sga_target is just 1 example. I had it with streams_pool_size and pga_aggreaget_target as well.

It's a good idea to start with restart_spparameter_changed: false as default.
Otherwise the instance is bounced each time oradb_mange_parameter is executed...

[bartowl]

Rebased against Rendanic/proracle_db and added some missing fixes. This has been tested against FS storage 19c with python3 and works excellent.