pam_fscrypt: decide cache dropping behavior automatically

Configuring whether pam_fscrypt drops caches or not isn't really
something the user should have to do, and it's also irrelevant for v2
encryption policies (the default on newer systems).  It's better to have
pam_fscrypt automatically decide whether it needs to drop caches or not.

Do this by making pam_fscrypt check whether any encryption policy keys
are being removed from a user keyring (rather than from a filesystem
keyring).  If so, it drops caches; otherwise it doesn't.  This
supersedes the "drop_caches" option, which won't do anything anymore.

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