cve-update-db-native: improve metadata parsing

The metadata parser is fragile: first it coerces a bytes() to a str() (so the
string is b'LastModifiedDate:2019...'), assumes the first line is the date, and
then uses a regex to parse (which then includes the trailing quote as part of
the date).

Clean this up by parsing the bytes as UTF-8 (ASCII is probably fine, but this is
safer), iterate through the lines and split on colons to find the right
key/value pair.

(From OE-Core rev: bb4e53af33d6ca1e9346464adbdc1b39c47530f3)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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