[code-reflection] RFR: [hat] Script for remote testing on GPU servers

[Juan Fumero]

This path adds a new script for remote testing. 

### How to use it? 

1. Generate a config file:


bash ./scripts/remoteTesting.sh --generate-config-file


2. Fill the template 

Template is located in `<babylon>/hat/remoteTesting.conf`.

Example:


# HAT Remote Testing Settings
SERVERS=server1 server2 server3
REMOTE_USERS=user1 user2 user3

#List of Backends to test
BACKENDS=ffi-cuda ffi-opencl

## Remote path. It assumes all servers use the same path
REMOTE_PATH=repos/babylon/hat
## Branch to test
BRANCH=hat/dialect/ops


3. Generate ssh-keys for all servers and run ssh-copy-id 

4. Run the script without parameters


bash ./scripts/remoteTesting.sh 


#### Print help


bash scripts/remoteTesting.sh --help


## Notes

- The testing script assumes all servers have installed Babylon + HAT before (so the Babylon JDK has been built)
- The path to access all servers is the same 
- The testing script setups the environment using `source setup.sh`

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Commit messages:
 - [hat] Script for remote testing

Changes: https://git.openjdk.org/babylon/pull/580/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=580&range=00
  Stats: 187 lines in 2 files changed: 187 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/580.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/580/head:pull/580

PR: https://git.openjdk.org/babylon/pull/580