Move Galera method to new separate class

        - add getWsrepParameters method
        - fix variables naming

Related: PROD-27561 (PROD:27561)

Change-Id: I5184f995f5cd979605c12d2c9794b6a610902e88
(cherry picked from commit 8f0f3ac38df0a089f8bd52bd68be78ce7594452b)
(cherry picked from commit 5df75785c01ad9965f9ef21461b8007a0538b922)
2 files changed