IGNITE-18348 Change deprecated Ignite.active() to IgniteCluster.activ…

[J-Bakuli]

…e() while Ignite.active(boolean active) to Ignite.cluster().state().

Ignite.active() and Ignite.active(boolean active) are deprecated since 2018.

As per the ignite docs:

Ignite.active() -> it is recommended to use IgniteCluster.active() instead;

Ignite.active(boolean active) -> it is recommended to use IgniteCluster.active(boolean active) instead.

It seems that it is time to update these deprecated methods, update the corresponding ignite docs.

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