Changed all .scala and .java files to ASF license headers.

[mrutkows]

Updated all .scala files in all dirs. to the ASF approved header. In addition, found a handful of .java files and updated similarly.

[markusthoemmes]

Can we take out scancode validation of the old header to make sure we haven't forgotten any files?

[mrutkows]

@markusthoemmes was going to remove the IBM header in a separate "phase" once all repos. were similarly updated. Phase 1 is pointing this repo. (and others that currently scan) to the version in "utils" ... #2365 "Reference scancode from utils repo. but preserve local copy (phase 1)"

and was being cautious in this PR as to to easily see that all the 225 files only had header/comment changes. This also follows Carlos' advice given in another PR when we tried to remove local scancode previously (to instead go in phases).

Opened the following issue in utils to track Phase 2 removal of local scancode and Phase 3 removal of IBM headers:
#2376 "Phase 2: Remove scancode from openwhisk repo." and apache/openwhisk-utilities#10 "Phase 3: Remove IBM license header"

[mrutkows]

@csantanapr @markusthoemmes Can we accept simply changing the headers here in this repo. to ASF as we have other issues (and a PR for pointing to new scancode) to remove IBM header (as a valid scan for all repos.) as part of phase 3?

[csantanapr]

this is good step towards changing all the headers. PR #2376 will take care of checking that IBM is not present