Block the addition of ssl_ca certificates with same subject name
Test Plan:
PASS: Attempted to install another certificate with same subject, and
verified that it fails with an error.
PASS: Generate and install a full iso and verified that columns subject
and hash_subject were added to certificate table.
PASS: Verified that when there is a subject name clash the command
system certificate-install returns an error and the certificate
that has the same subject
PASS: Verified that the system shows an error when the subject field is
emtpy for ssl_ca
PASS: Verified that a new column subject shows up for command
system certificate-list
PASS: Verified that a new column subject shows up as a return to
a successful system certificate-install command
Depends-on: https://review.opendev.org/c/starlingx/ansible-playbooks/+/851894
Closes-bug: 1981100
Signed-off-by: Karla Felix <karla.karolinenogueirafelix@windriver.com>
Change-Id: I7ce11cc5dab6f686d360d01594ba100d07d2c2db
7bd617b2fb