[cfg01] Schedule x509.get_pem_entries mine update

[cfg01] Schedule x509.get_pem_entries mine update

Previously, Salt Master CA mine was only sent once, during
salt.minion.ca state execution at cfg01 bringup / bootstrap.

This causes possible issues with:
- Salt Master container restart (mine data is lost);
- UNH Lab deployment (uknown rootcause, might be related to XFS and
  overlay2 being used with Docker on CentOS);

To bypass this issue, make x509.get_pem_entries module send mine data
at the default mine interval (60 minutes).

Change-Id: I5f6334ae18f5af6cbe0a164791603b67f0a3668f
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
(cherry picked from commit 5ec93b557da3784144b7000be5245bbf5d1bb4f4)