fix: update install_admin_cluster.sh

[dwatrous]

Description

General updates

Change summary

• Fix some typos
• root login was not working, so I changed to login as a user and change to root
• ensure appropriate permissions exist to be able to write the ssh key as metadata

[apeabody]

Thanks @dwatrous! From the Linter:

Running shellcheck

In ./anthos-bm-gcp-bash/install_admin_cluster.sh line 130:
  --member="serviceAccount:$(gcloud projects describe $PROJECT_ID --format="value(projectNumber)")[email protected]" \
                                                      ^---------^ SC2086: Double quote to prevent globbing and word splitting.


In ./anthos-bm-gcp-bash/install_admin_cluster.sh line 133:
  --member="serviceAccount:$(gcloud projects describe $PROJECT_ID --format="value(projectNumber)")[email protected]" \
                                                      ^---------^ SC2086: Double quote to prevent globbing and word splitting.


In ./anthos-bm-gcp-bash/install_admin_cluster.sh line 136:
  --member="serviceAccount:$(gcloud projects describe $PROJECT_ID --format="value(projectNumber)")[email protected]" \
                                                      ^---------^ SC2086: Double quote to prevent globbing and word splitting.

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...

[apeabody]

/gcbrun

[apeabody]

/gcbrun

[dwatrous]

I updated the file based on Linter feedback.

[apeabody]

/gcbrun

[apeabody]

Thanks @dwatrous!