When using apparmor_parser from the host, pin the supported policy to ABI 3.0
if one is present on the host. This way even on distributions with Apparmor
4.0, we get the behavior of 3.0 and the meaning of our apparmor profiles stays
the same. At the same time apparmor 2.0 distributions remain unchanged.
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
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