Support port creation through workspace name

[kishen-v]

Add support to create port by --workspace-name. Added flags to parse --workspace-name for ease of usage.

./pvsadm create port --workspace-name XXX-test-csi-k8s --network c922fe46-4b71-XXXX-XXXX-168e0794419e
Error: unknown flag: --workspace-name

Tests:

Using workspace name

./pvsadm create port --workspace-name XXX-test-csi-k8s --network c922fe46-4b71-XXXX-XXXX-168e0794419e
W0912 14:41:26.223930   55924 root.go:54] IBMCLOUD_API_KEY will be deprecated in future releases. Use IBMCLOUD_APIKEY instead.
I0912 14:41:32.615848   55924 port.go:89] Successfully created a port, id: a4f7a177-eb14-4552-9123-fb61bf7XXXX
I0912 14:41:32.615848   55924 port.go:89] Successfully created a port, id: a4f7a177-eb14-4552-9123-fb61bf70XXXX
+-------------+------------+------+---------------+-------------------+--------------------------------------+-------------+--------+
| DESCRIPTION | EXTERNALIP | HREF |   IPADDRESS   |    MACADDRESS     |                PORTID                | PVMINSTANCE | STATUS |
+-------------+------------+------+---------------+-------------------+--------------------------------------+-------------+--------+
|             |            |      | 192.168.232.3 | fa:16:3e:d4:25:ae | a4f7a177-eb14-4552-9123-fb61bf70XXXX |             | DOWN   |
+-------------+------------+------+---------------+-------------------+--------------------------------------+-------------+--------+

Using workspace ID

./pvsadm create port --workspace-id 45489157-XXXX-XXXX-XXXX-54a2d96b0233 --network c922fe46-XXXX-XXXX-8c1c-168e0794419e
W0912 14:45:46.354622   57573 root.go:54] IBMCLOUD_API_KEY will be deprecated in future releases. Use IBMCLOUD_APIKEY instead.
I0912 14:45:51.514981   57573 port.go:89] Successfully created a port, id: 563472d6-1225-4c9e-b4ce-c45a472cXXXX
+-------------+------------+------+---------------+-------------------+--------------------------------------+-------------+--------+
| DESCRIPTION | EXTERNALIP | HREF |   IPADDRESS   |    MACADDRESS     |                PORTID                | PVMINSTANCE | STATUS |
+-------------+------------+------+---------------+-------------------+--------------------------------------+-------------+--------+
|             |            |      | 192.168.232.4 | fa:16:3e:29:a0:ec | 563472d6-1225-4c9e-b4ce-c45a472XXXX |             | DOWN   |
+-------------+------------+------+---------------+-------------------+--------------------------------------+-------------+--------+

Missing workspace id/name

./pvsadm create port
W0912 14:48:13.027461   58383 root.go:54] IBMCLOUD_API_KEY will be deprecated in future releases. Use IBMCLOUD_APIKEY instead.
Error: --workspace-id or --workspace-name required

[mkumatag]

/lgtm

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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