system tests for chimney update image

[boddumanohar]

we should have a system tests to

				"getcontainers":          GetContainers,
				"updatecontainer":        UpdateContainer,
				"searchcontainer":        SearchContainer,

https://github.com/0chain/gosdk/blob/staging/wasmsdk/proxy.go#L183-L185

[boddumanohar]

this should be done as a part of wasm system tests

the procedure for system_test can:

1. deploy a blubber using chimney script

test:

1. call the wasm function: getcontainers that should return all the containers on the chimney blobber
2. call the wasm function: updatecontainer should successfully update the container with the latest staging image. This should update the container without failure.
3. call the wasm function: searchcontainer with parameter: "blobber" should return blobber container.