XOP-497:NetScaler suppack install fails for drivers

1. supplementalpack.py setup unconditionally sets the install (-i)
option for driver-rpms.
2. When the kernel version is not changed, but a new version of the
driver is released, the install script tries to install the new version
over the existing files. rpm reports conflicts with file due to this.
3. This commit removes the unconditional -i option in setup for the
driver-rpm files.
4. During install, chooses to upgrade if the filename with name:
modname+kernelversion is the same for the installed and installing
files.