Add `os::cmd::try_until_not_text` utility function
Add `os::cmd::try_until_not_text` utility function

Previously it has not been possible to run a command until some text no
longer appears in the output. This patch adds that functionality.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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