remove k10multicluster from downloads

[rgee0]

Description

• Removes k10multicluster hopefully in a temporary sense as the v7.0.0 release does not include binaries for it.
  As it is a disabling, rather than removal, the relevant parts of the code have been block commented for the time being

• Repoints cmctl tool to its new locacation on github

Motivation and Context

• I have raised an issue to propose this change, which has been given a label of design/approved by a maintainer (required)
  k10multicluster not found in latest kastenhq/external-tools release #1082 tracks the k10multicluster issue but should not be closed as a result of this change.
  Closes The cmctl and kubectl_cert-manager binaries have been moved #1081 with the cmctl changes - worth noting there is a PR which if merged will consolidate kubectl_cert-manager and cmctl binaries into cmctl

How Has This Been Tested?

e2e-url-checker now runs green

The k10multicluster testing is a bit negative, owing to this being a removal:

➜  arkade git:(disableK10multicluster) make build
go build
➜  arkade git:(disableK10multicluster) ./arkade get k10multicluster
Error: tool k10multicluster not found
➜  arkade git:(disableK10multicluster) ./hack/test-tool.sh k10multicluster
+ ./arkade get k10multicluster --arch arm64 --os darwin --quiet
Error: tool k10multicluster not found
+ ./arkade get k10multicluster --arch x86_64 --os darwin --quiet
Error: tool k10multicluster not found
+ ./arkade get k10multicluster --arch x86_64 --os linux --quiet
Error: tool k10multicluster not found
+ ./arkade get k10multicluster --arch aarch64 --os linux --quiet
Error: tool k10multicluster not found
+ ./arkade get k10multicluster --arch x86_64 --os mingw --quiet
Error: tool k10multicluster not found

cmctl location change:

➜  arkade git:(disableK10multicluster) make build                                                     
go build
➜  arkade git:(disableK10multicluster) ./hack/test-tool.sh cmctl                                      
+ ./arkade get cmctl --arch arm64 --os darwin --quiet
+ file /Users/rgee0/.arkade/bin/cmctl
/Users/rgee0/.arkade/bin/cmctl: Mach-O 64-bit executable arm64
+ rm /Users/rgee0/.arkade/bin/cmctl
+ echo

+ ./arkade get cmctl --arch x86_64 --os darwin --quiet
+ file /Users/rgee0/.arkade/bin/cmctl
/Users/rgee0/.arkade/bin/cmctl: Mach-O 64-bit executable x86_64
+ rm /Users/rgee0/.arkade/bin/cmctl
+ echo

+ ./arkade get cmctl --arch x86_64 --os linux --quiet
+ file /Users/rgee0/.arkade/bin/cmctl
/Users/rgee0/.arkade/bin/cmctl: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=DSNszFe7snPY457Rb-u0/r2MAsc3CBMB_Yf51mygd/D_5fU4N3ds1FygkvS9Bv/6OETL5AFf38M-qjn8yUx, stripped
+ rm /Users/rgee0/.arkade/bin/cmctl
+ echo

+ ./arkade get cmctl --arch aarch64 --os linux --quiet
+ file /Users/rgee0/.arkade/bin/cmctl
/Users/rgee0/.arkade/bin/cmctl: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, Go BuildID=nOaMMTseeIShIxKNkDoQ/p0Q21wX8ZP6P05oTwfjC/0Oo0PuK-VkO-DHSmhB3U/imrswImJGEt3gowkVI1X, stripped
+ rm /Users/rgee0/.arkade/bin/cmctl
+ echo

+ ./arkade get cmctl --arch x86_64 --os mingw --quiet
+ file /Users/rgee0/.arkade/bin/cmctl.exe
/Users/rgee0/.arkade/bin/cmctl.exe: PE32+ executable (console) x86-64, for MS Windows
+ rm /Users/rgee0/.arkade/bin/cmctl.exe
+ echo

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Documentation

• I have updated the list of tools in README.md if (required) with ./arkade get --format markdown
• I have updated the list of apps in README.md if (required) with ./arkade install --help

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s

• I have tested this on arm, or have added code to prevent deployment

[alexellis]

Approved