v1.2.2

Mostly performance improvements and bug fixes for Fedora 34.

• cirrus: set selinux to permissive
• hook: delay SIGUSR1
• Cirrus: Use shared get_ci_vm container image
• Cirrus: Update to F34beta VM image
• ebpf: check for NULL
• ebpf: move prctl handling to ebpf
• ebpf: memorize what syscalls were notified
• Test suite: minimal tweaks for gating environment