The SAIP specification version implicitly determines which filesystem
templates (or versions thereof) are supported. So if a given eUICC
states it implements SAIP version 2.3.0, then we have to translate
this into which template versions that means. The new SaipSpecVersion
and its derived classes do exactly that.
Change-Id: I3a894c72c22e42bd2067e067be80a67197ad1bf2