Remove kernel version from name of dtrace-modules-provider-headers package.

Remove kernel version from name of dtrace-modules-provider-headers package.

This package had a kernel-version-dependent name on the grounds that it
consisted of kernel headers meant to be included by a single kernel version.
This reasoning was flawed: the headers do not change as the kernel is rebuilt,
and as the package provides files that are not under a kernel-version-specific
path, 'yum update' can attempt to install two versions at once, and conflict.

The right solution is to name the package without a kernel-version-specific part.
(We keep the name unchanged when built against earlier kernels, to avoid
sneaking unrelated changes into security errata releases.)

Orabug: 18061595
Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>