Add Test code for validator active status check

[heejin-github]

• change package name to rpc for health
• Add Test code for validator active status check

[heejin-github]

# go test ./... -v
=== RUN   TestAPI
--- PASS: TestAPI (0.00s)
=== RUN   TestParse
--- PASS: TestParse (0.00s)
=== RUN   TestGetStatus
--- PASS: TestGetStatus (0.00s)
=== RUN   TestGetHealth
--- PASS: TestGetHealth (0.00s)
=== RUN   TestGetBondStatus
--- PASS: TestGetBondStatus (0.00s)
PASS
ok  	github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos	(cached)
?   	github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/mocks	[no test files]

go test -coverprofile cover.out
PASS
coverage: 54.4% of statements
ok  	github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos	0.003s

go tool cover -func=cover.out
github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/api.go:66:		GetStatus	70.6%
github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/api.go:97:		parseRawStatus	80.0%
github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/api.go:108:	NewClient	100.0%
github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/health.go:8:	GetHealth	77.8%
github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/net_info.go:83:	GetNpeers	0.0%
github.com/dsrvlabs/vatz-plugin-cosmoshub/rpc/cosmos/validators.go:54:	GetBondStatus	72.2%
total:									(statements)	54.4%