ICSHWI-7388: Add EPICS_*_ADDR_LIST parsing from metadata file

Adds the ability to parse the address_list field from ioc.yml.

Note that at the moment, the testing does not test for EPICS_PVA_ADDR_LIST. This is because the iocsh.bash output does not list that variable, a ticket has been added to the e3 team for this. It would be possible to read this also from the ioc_activate.sh file, but for now I am happy to leave that out since EPICS_CA_ADDR_LIST and EPICS_PVA_ADDR_LIST are the same.