Here we add purl2sym support for a list of PURLs listed below.

1. Add support in FetchCode and PurlDB
2. Test of end-to-end support in the PurlDB

• pkg:generic/hostapd
• pkg:generic/iptables
• pkg:generic/libnl
• pkg:generic/nftables
• pkg:generic/samba
• pkg:generic/wpa_supplicant
• pkg:generic/lighttpd
• pkg:generic/iproute2