Remove all references to x-pack from build, distribution and qa directories.

[adnapibar]

There are several places in the fork that references the use of x-pack. We need to clean those up from the repository.

[saratvemulapalli]

• rest-high-level client also still has some x-pack traces.
  Example: client/rest-high-level/src/test/java/org/elasticsearch/client/transform/transforms/hlrc/TransformCheckpointingInfoTests.java:56

[adnapibar]

• rest-high-level client also still has some x-pack traces.
  Example: client/rest-high-level/src/test/java/org/elasticsearch/client/transform/transforms/hlrc/TransformCheckpointingInfoTests.java:56

That should be covered by the #2 (see the checkbox for transform which Nick is working on)

[saratvemulapalli]

• rest-high-level client also still has some x-pack traces.
  Example: client/rest-high-level/src/test/java/org/elasticsearch/client/transform/transforms/hlrc/TransformCheckpointingInfoTests.java:56

That should be covered by the #2 (see the checkbox for transform which Nick is working on)

Nice!