[4.x] Fix initialization of RedisOptions and Redis[*]ConnectOptions

[Ladicek]

This commit makes sure that:

• all mandatory fields of RedisOptions are initialized (initializing them only in Redis[*]ConnectOptions is not enough due to the usage of copy constructors);
• all constructors of subclasses of RedisConnectOptions properly delegate to the corresponding superclass constructors;
• the JsonObject-accepting constructors of subclasses of RedisConnectOptions call the correct conversion function, after delegating to the corresponding superclass constructor, which calls its own conversion function.

Backport of #428 to 4.x

[vietj]

this seems to contain breaking change ? I can see that the java converters are changed

[Ladicek]

Yes. I can drop the @GenIgnore annotations in this PR, which targets 4.x, because the Vert.x code generator processes properties in alphabetical order, therefore getEndpoints()/setEndpoints() always comes last and no information is lost.

In the corresponding PR to master, the @GenIgnore annotations actually prevent information loss, because the Vert.x codegen processes properties in declaration order. Actually, I can just reorder the getters and setters and don't have to add @GenIgnore.

I'll drop the @GenIgnore annotations here, and in the PR to master, I'll drop the @GenIgnore annotations and reorder the getters/setters.

[Ladicek]

Done, both here and in #428.

[vietj]

@Ladicek can you fix the conflicts for this PR so I can merge it ?

[Ladicek]

Rebased and resolved conflict.