dpkg provider fails at packages with a dash in it, causing packages to be re-installed on every chef run

dpkg provider doesn't correctly set @current_resource.package_name in #load_current_resource when the package name contains a dash (a plus character would probably also fail). This happens because the regex used to extract the package name from the output of dpkg -s doesn't accept those characters. From IBM's page on debian packages:

( http://www.ibm.com/developerworks/linux/library/l-debpkg.html )
The name of the package itself (not the filename, just the name of the package) can contain lowercase letters, numbers, and the "-" and "" characters. (It might sound odd for a package to have a "" in the package name, but it is used for several packages like "doc+" – a documentation system for C/C+ code.) So, "mypackage-2++" is a perfectly valid package name, while "MY_Package" or "mypackage2.0" would not be.

See the error in action at https://gist.github.com/0fe1cdb9445f108601d7

Solution is to change the regexp.