rhel7: Fix rpm install failure.

When trying to install the kernel module rpm built for RHEL7,
the install failed with following conflicts:

  # rpm -i kmod-openvswitch-2.3.1-1.el7.x86_64.rpm
    file /lib/modules/3.10.0-123.8.1.el7.x86_64/modules.devname
    from install of kmod-openvswitch-2.3.1-1.el7.x86_64 conflicts
    with file from package kernel-3.10.0-123.8.1.el7.x86_64

    file /lib/modules/3.10.0-123.8.1.el7.x86_64/modules.softdep
    from install of kmod-openvswitch-2.3.1-1.el7.x86_64 conflicts
    with file from package kernel-3.10.0-123.8.1.el7.x86_64

Similar issue has already been reported and solved here:

    https://bugzilla.redhat.com/show_bug.cgi?id=1003267

This commit applies the solution in the link to ovs.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Gurucharan Shetty <gshetty@nicira.com>

rhel/openvswitch-kmod-rhel6.spec.in

@@ -61,6 +61,9 @@ export INSTALL_MOD_DIR=extra/%{oname}
 for flavor in %flavors_to_build ; do
          make -C %{kernel_source $flavor} modules_install \
                  M="`pwd`"/_$flavor/datapath/linux
+
+         # Cleanup unnecessary kernel-generated module dependency files.
+         find $INSTALL_MOD_PATH/lib/modules -iname 'modules.*' -exec rm {} \;
 done
 install -d %{buildroot}%{_sysconfdir}/depmod.d/
 install -m 644 %{oname}.conf %{buildroot}%{_sysconfdir}/depmod.d/