fedora25_install: Provide installer script for Fedora 25

fedora25_install: Provide installer script for Fedora 25

Adds installer script for Fedora 25. Kernel version on Fedora 25
requires DPDK 16.11 and newer. VSPERF user must use DPDK and OVS
versions, which are compatible with installed kernel.

Adds new folder for current distribution with installation scripts.

JIRA: VSPERF-453

Change-Id: Icb86ea7655e95df57a8052e4a8523348a0c75dc0
Signed-off-by: Martin Goldammer <martinx.goldammer@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Bill Michalowski <bmichalo@redhat.com>
Reviewed-by: Antonio Fischetti <antonio.fischetti@intel.com>
Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>