Added LMOVE and BLMOVE but cannot test, blocked on PR

[shoaib42]

Hello maintainers!

I added the LMOVE and BLMOVE operations as

lmovell for lmove src dest left left
lmovelr for lmove src dest left right
lmoverl for lmove src dest right left
lmoverr for lmove src dest right right

I tried to execute the tests but I get errors related to docker etc. Is there a CONTRIBUTE doc (or any doc) that I can go through that describes the dependencies for test?

[info] com.redis.cluster.ReconnectableSpec *** ABORTED ***
[info]   com.spotify.docker.client.exceptions.DockerException: java.util.concurrent.ExecutionException: javax.ws.rs.ProcessingException: java.io.IOException: Permission denied
[info]   at com.spotify.docker.client.DefaultDockerClient.propagate(DefaultDockerClient.java:2848)
[info]   at com.spotify.docker.client.DefaultDockerClient.request(DefaultDockerClient.java:2712)
[info]   at com.spotify.docker.client.DefaultDockerClient.inspectImage(DefaultDockerClient.java:1509)
[info]   at com.whisk.docker.testkit.DockerContainerManager.$anonfun$ensureImage$2(DockerContainerManager.scala:56)
[info]   at scala.concurrent.BlockContext$DefaultBlockContext$.blockOn(BlockContext.scala:62)
[info]   at scala.concurrent.package$.blocking(package.scala:124)
[info]   at com.whisk.docker.testkit.DockerContainerManager.$anonfun$ensureImage$1(DockerContainerManager.scala:56)
[info]   at scala.concurrent.Future$.$anonfun$apply$1(Future.scala:678)
[info]   at scala.concurrent.impl.Promise$Transformation.run(Promise.scala:467)
[info]   at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426)