split up compute VM and container-related samples

[joshgav]

VM and container-related samples are all in the compute/ directory now, but since most people look for them independently we should probably split them into compute/ and containers/.

[t-0-m-1-3]

@joshgav I split the files up into directories, I'm running into a problem testing though go test -v ./... will bring up a list of

use of internal package not allowed

for all the internal imports. Did I mess up my go get?

https://github.com/t-0-m-1-3/azure-sdk-for-go-samples/tree/myFork/container_split

[t-0-m-1-3]

reading #237 and #238