redhat: Cleanup some unneeded parameters

redhat: Cleanup some unneeded parameters

In the Quagga.spec file we have these fixes:

1) rpmversion was being defined but never used in it's scope.
Made it global so it couldbe properly referenced.

2) Use texi2html to tell you it's version instead of rpm
Note for the future to convert to mock we will need to
find a different methodology to handle this.

3) vtysh/isisd and pimd are turned on by default
No need to call them out.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>