Revert "Check VM's console log before trying to SSH to it."

This reverts commit e3405ba808f97eae57f3a60991000afaa34cbe89.

AFAICT wait_for_sshable has never been wired up for any tests either
in-tree or within the wider opendev namespace:

https://codesearch.opendev.org/?q=wait_for_sshable

Remove this before introducing a fresh implementation overloading the
original wait_unil kwarg.

Change-Id: I15b5cdcda387e4868d4431c86ad087f3e3e2c8fe
3 files changed