Add missing PyYAML dependency

packaging/debian/control

 Depends:
  jattool (= ${source:Version}),
  python-jinja2,
+ python-yaml,
 Description: __MKIT_PROJ_NAME__ - __MKIT_PROJ_TAGLINE__
  JAT is a testing framework for Shell-based test suites.
  .

packaging/template.spec

 %package report
 Requires: %jinja_req
 Requires: jattool-minimal == %{version}
+Requires: PyYAML
 Summary: JAT result post-processing
 %description report
 JAT is a testing framework for Shell-based test suites.