Changes

pySim.esim.saip: Add methods to rebuild "mandatory" lists in ProfileHeader

The ProfileHeader PE contain lists of template-oids and services that
are mandatory in this profile.  Let's add methods that can be used to
(re-) compute those lists based on the actual PE contents of the
sequence.

The idea is that during programmatic construction of a profile, those methods
would be called after appending all PEs, just before encoding the
profile as DER.

Change-Id: Ib43db8695c6eb63965756364fda7546d82df0beb