Update prometheus metadata.yaml

ping: add "network" config option (netdata#1348)

Update vsphere charts.go

Update metadata.yaml (netdata#1305)

Co-authored-by: Ilya Mashchenko <[email protected]>

Update elasticsearch/README.md

fix parent_table in doDBQueryStatIOUserTables (netdata#1205)

Update Cassandra yaml (netdata#1203)

Co-authored-by: ilyam8 <[email protected]>

feat(ping): add 'interface' option (netdata#1179)

docker: add not_running_unhealthy state (netdata#1160)

filecheck: replace space with underscore in dim (netdata#1158)