rhel: Rename the IPsec package as openvswitch-ipsec

rhel: Rename the IPsec package as openvswitch-ipsec

Currently the split package for ipsec is named
openvswitch-openvswitch-ipsec, but it should be named openvswitch-ipsec.

This commit changes the spec file in order to have the IPsec package as
openvswitch-ipsec instead of openvswitch-openvswitch-ipsec.

CC: Qiuyu Xiao <qiuyu.xiao.qyx@gmail.com>
Fixes: bdddc715358e ("debian and rhel: Create IPsec package.")
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>