[18.06] backport various Bash completion script updates

[thaJeztah]

Cherry-picks of the following PR's for 18.06

• Add bash completion for service logs --details|--raw #1215 Add bash completion for service logs --details|--raw
• Add bash completion for kubernetes orchestrator #1254 Add bash completion for kubernetes orchestrator
• Remove outdated completion reviewers file #1256 Remove outdated completion reviewers file
• Add bash completion for cp --archive #1269 Add bash completion for cp --archive
  • since 17.06
• Fix shellcheck warnings #1271 Fix shellcheck warnings

git checkout -b 18.06-completion-updates upstream/18.06

# https://github.com/docker/cli/pull/1215
git cherry-pick -s -S -x 4912846de22fe3efd4b9fe8e3059615948f9112a

# https://github.com/docker/cli/pull/1254
git cherry-pick -s -S -x ff953751d342f7815060593d14763030af77621c
git cherry-pick -s -S -x 8ef01e869ea55aa3eb860ee4e7e60a44a5d0ff81
git cherry-pick -s -S -x 08f8ee13200d0a69b1e4fbd72ffe9c7d55a152b4

# https://github.com/docker/cli/pull/1256
git cherry-pick -s -S -x 9022a00fbe2aa47da5a17652144b028dc32292d9

# https://github.com/docker/cli/pull/1269
git cherry-pick -s -S -x b9b3754ad3fc795942bc7388b8d143701bf19515

# https://github.com/docker/cli/pull/1271
git cherry-pick -s -S -x e587ec293bf154281215189487d7504cc1d70666

cherry-pick was clean; no conflicts

[albers]

LGTM, thanks

[silvin-lubecki]

LGTM