Add a package manager parser plugin

Add a package manager parser plugin

This is a plugin library of package manager to install ISU Packages in
the RPK format.

The RPK package should contain:
 * the content of the ISU zip archive and,
 * tizen-manifest.xml,
 * correctly generated signature files.

The tizen-manifest.xml file should contain a description of the ISU
package, for example:

    <?xml version="1.0" encoding="utf-8" standalone="no"?>
    <manifest xmlns="http://tizen.org/ns/packages" api-version="1.0.0"
     package="org.tizen.isu.example_service"
     res-type="tizen.sample.resource" res-version="1.5.0" version="1.0.0">
      <isu>
	  <name>example_service</name>
	  <version>1.0.0</version>
      </isu>
      <allowed-package id="org.tizen.*"/>
    </manifest>

Change-Id: I3978b3e507f368ce87e47932f04b26dfaddf9a73