added percona_toolkit to gh-ost role (#5226)
added percona_toolkit to gh-ost role (#5226)


EDUlib/configuration,mitodl/configuration,edx/configuration,appsembler/configuration,arbrandes/edx-configuration,stvstnfrd/configuration,edx/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,mitodl/configuration,mitodl/configuration,mitodl/configuration,stvstnfrd/configuration,stvstnfrd/configuration,stvstnfrd/configuration,edx/configuration,appsembler/configuration,edx/configuration,EDUlib/configuration,appsembler/configuration,stvstnfrd/configuration,EDUlib/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,EDUlib/configuration,EDUlib/configuration,appsembler/configuration