[extras] Fixup parsing and Readme to match LinuxLink behavior.

- Convert ' ' in product names to '-'
- Convert ' ' in version strings to '.'
- Check for 'product' in header instead of 'package'

- Remove mention of ignoring '#' and blank lines in Readme
  We still ignore them, but LinuxLink doesn't support the same and
  we don't want to mis-lead users into thinking that they can rely
  on it being compatible with an online upload of the same file.

- Remove quotes from single-license example, but add another example
  with a dual-license where the licenses are seperated by ',', therefore
  requiring quoting.

- Tweak example in Readme to reflect the syntax updates:

    $ cat yocto-extra.csv
    product,version,license
    avahi,0.6
    bash,4.0
    bash,4.1,GPL 3.0
    busybox,
    udev,,"GPLv2.0+, LGPL-2.1+"

README.md

@@ -310,25 +310,16 @@ The CSV files consist of an optional header and the following fields:
 * (optional) Version - the version of the package used.
 * (optional) License - the license of the package used
 
-Blank lines and those starting with **#** are ignored.
-
-One example:
+The following example shows the accepted syntax for expressing extra packages:
 
 ```sh
 $ cat yocto-extra.csv
-# Optional Header:
 product,version,license
-
-# Comments start with '#' and are ignored.
-
-avahi, 0.6
-
-# Blank lines are also ignored
-
-bash, 4.0
-bash, 4.1, "GPL 3.0"
-
-busybox
+avahi,0.6
+bash,4.0
+bash,4.1,GPL 3.0
+busybox,
+udev,,"GPLv2.0+, LGPL-2.1+"
 ```
 
 

classes/vigiles.bbclass

@@ -248,21 +248,20 @@ def _get_extra_packages(d):
 
     # Check for a CSV header of e.g. "package,version,license" and skip it
     header = extra_rows[0]
-    if header[0].lower() == "package":
+    if header[0].lower() == "product":
         extra_rows = extra_rows[1:]
 
     for row in extra_rows:
-        pkg = row[0]
-        ver = row[1]
+        pkg = row[0].replace(' ', '-')
+        ver = row[1].replace(' ', '.')
         license = row[2]
         license_key = pkg + ver
 
         bb.debug(1, "Extra Package: %s, Version: %s, License: %s = %s" %
                  (pkg, ver, license_key, license))
 
         pkg_vers = set(additional['additional_packages'].get(pkg, []))
-        if ver:
-            pkg_vers.add(ver)
+        pkg_vers.add(ver)
 
         additional['additional_packages'][pkg] = sorted(list(pkg_vers))
         additional['additional_licenses'][license_key] = license