Use old name for Jinja2 dependency

RHEL6 and older call it python-jinja2, then it's called python2-jinja2.

Fixes #3.

packaging/template.spec

 %global sfincb %{_datadir}/shellfu/include-bash
 %global shellfu_req shellfu >= 0.10.8, shellfu < 0.11
 %global saturnin_req shellfu-bash-saturnin >= 0.4.12, shellfu-bash-saturnin < 0.5
+%if 0%{?rhel} && 0%{?rhel} < 7
+%global jinja_req python-jinja2
+%else
+%global jinja_req python2-jinja2
+%endif
 
 Name:       __MKIT_PROJ_PKGNAME__
 Version:    __MKIT_PROJ_VERSION__
 running.
 
 %package report
-Requires: python2-jinja2
+Requires: %jinja_req
 Requires: jattool-minimal == %{version}
 Summary: JAT result post-processing
 %description report