3788: Tool to convert v2 XML to v3 XML

Draft of an XSLT to convert version 2 glideinWMS factory XML to version 3.

Execute as:
xsltproc convert_factory_2to3.xslt glideinWMS.xml -o glideinWMS-new-v3.xml

(xsltproc comes with libxslt in most distributions).
3789: Tool to convert v2 frontend XML to v3 XML

Draft of an XSLT to convert version 3 glideinWMS factory XML to version 3.

Execute as:
xsltproc convert_frontend_2to3.xslt frontend.xml -o frontend-new-v3.xml

(xsltproc comes with libxslt in most distributions).
Add comment to convert_factory_2to3
3788: Add friendly bash script convert_factory_2to3.sh
3788.  Fixed a few remaining config changes needed for the conversion.
3789  Added comments and removed log retention defaults.
3789: Add friendly bash script convert_frontend_2to3.sh
Merge branch 'master_3788'
Merge branch 'master_3789'