Remove %changelog from spec file

Remove the %changelog section from the spec files since it does
not get updated in the master branch.  Not only does this mean
the information is stale, but it can result in 'make deb' failing
to build packages, issue #7825.  This section should be updated
for tagged releases.

Reviewed-by: Giuseppe Di Natale <guss80@gmail.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #7825
Closes #7827

rpm/generic/zfs-dkms.spec.in

@@ -79,7 +79,3 @@ if [ "$SPEC_META_ALIAS" = "$DKMS_META_ALIAS" ]; then
     dkms remove -m %{module} -v %{version} --all %{!?not_rpm:--rpm_safe_upgrade}
 fi
 exit 0
-
-%changelog
-* %(date "+%a %b %d %Y") %packager %{version}-%{release}
-- Automatic build by DKMS

rpm/generic/zfs-kmod.spec.in

@@ -158,8 +158,3 @@ chmod u+x ${RPM_BUILD_ROOT}%{kmodinstdir_prefix}/*/extra/*/*/*
 
 %clean
 rm -rf $RPM_BUILD_ROOT
-
-%changelog
-* Wed Jul 26 2017 Brian Behlendorf <behlendorf1@llnl.gov> - 0.7.0-1
-- Released 0.7.0-1, detailed release notes are available at:
-- https://github.com/zfsonlinux/zfs/releases/tag/zfs-0.7.0

rpm/generic/zfs.spec.in

@@ -428,8 +428,3 @@ systemctl --system daemon-reload >/dev/null || true
 # ignore those files.
 %exclude /usr/share/initramfs-tools
 %endif
-
-%changelog
-* Wed Jul 26 2017 Brian Behlendorf <behlendorf1@llnl.gov> - 0.7.0-1
-- Released 0.7.0-1, detailed release notes are available at:
-- https://github.com/zfsonlinux/zfs/releases/tag/zfs-0.7.0