Version string fixes for isc:dhcp and gnu:glibc

[gluesmith2021]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Fixes version mismatches

• What is the current behavior? (You can also link to an open issue here)

gnu:glibc can be matched with a string that sed fails to replace with gnu:glibc:version. Later on, in F20, glibc is ignored because of a "bad version format" and CVEs are not fetched

ISC DHCP client binaries match isc:dhcp_client product name. No CVE are found, whatever the version, since the NVD database uses isc:dhcp for the client, not isc:dhcp_client

• What is the new behavior (if this is a feature change)? If possible add a screenshot.

Proper product:version is returned and corresponding CVEs are reported

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No breaking change

• Other information:

[m-1-k-3]

Thank you for your contribution.