Deprecate bluemix-go and clean-up code.

[kishen-v]

Fixes: #496, #609.

Note: The changes are done, a quick round of testing across all sub-commands is complete, barring test.cloud.ibm.com

get:

• [x] cloud-connections List the existing cloud connections in the account Works with workspace ID or workspace name.
• [x] events Get Powervs events Works with workspace ID or workspace name.
• [x] per-availability List regions that support PER Works with workspace ID or workspace name.
• [x] ports Get PowerVS network ports 

  Works with workspace ID or workspace name/ network ID and network name


  delete:

• [x] port Delete PowerVS network port Works with workspace ID - network ID and network name

  create:

• [x] port Create PowerVS network port Works with workspace ID - network ID and network name

purge:

• [x] images Purge the powervs images
• [x] keys Delete PowerVS ssh key/keys
• [x] networks Purge the powervs networks
• [x] vms Purge the powervs vms

• [x] volumes Purge the powervs volumes

  dhcpserver

• [x] create Create DHCP Server
• [x] delete Delete DHCP Server
• [x] get Get DHCP Server

• [x] list Get PowerVS DHCP servers

  image

  • [x] import Import the image into PowerVS instances Works with public/private buckets, with HMAC/Without HMAC keys.
  • [x] sync Sync images between IBM COS buckets
  • [x] upload Upload the image to the IBM COS

  What wasn't tested: Testing in the test environment - https://test.cloud.ibm.com/login

  Additional tweaks/changes that are a part of this PR:

  pvsadm image upload - Iterate through the available set of keys until a credential with a binding HMAC key is found, rather than exiting out.

[kishen-v]

cc: @Karthik-K-N.

[mkumatag]

@kishen-v it will be great if you can divide this PR into two, one for deprecating and another for cleanup..

[kishen-v]

Working on splitting the PR to contain smaller changes. /hold

[mkumatag]

@kishen-v can you please rebase this PR?

[kishen-v]

/hold cancel

[mkumatag]

@kishen-v lets fix the remaining comments and merge the code

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishen-v, mkumatag

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