Remove no longer used BPF instance creation scripts (#1346)

Summary: We use qemu to run BPF tests and these scripts are no longer
used. So remove the scripts to avoid confusion. If we need a once off
instance, we can always check the gitlog to run the create instance
script.

Relevant Issues: N/A

Type of change: /kind cleanup

Test Plan: N/A this is unused code.

Signed-off-by: Vihang Mehta <vihang@pixielabs.ai>

Author: vihangm