ima: Add keyring support to IMA namespace

Changelog:
* Removed keyring creations for the IMA namespace. The keyring
  will be created by userspace.
  (from Stefan Berger <stefanb@linux.vnet.ibm.com>)
* Use _ima keyring for namespaces instead of .ima, which seems
  more practical for the cloud use case.
  (from Stefan Berger <stefanb@linux.vnet.ibm.com>)

Signed-off-by: Yuqiong Sun <suny@us.ibm.com>
Signed-off-by: Mehmet Kayaalp <mkayaalp@linux.vnet.ibm.com>
4 files changed