SystemD and FIFO Sockets in RHEL7

There's a bug with a relevant discussion on systemd's approach to FIFO socket deletion. As of systemd-214 the issue with "stale" sockets was resolved by supplying the `RemoveOnStop` option to its corresponding `.service`. However, at the moment RHEL7 has systemd-208 as the default version; and I am seeing the following errors in `dmesg` output:
systemd[1]: systemd 208 running in system mode. (+PAM +LIBWRAP +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ)
systemd[1]: /usr/lib/systemd/system-generators/anaconda-generator exited with exit status 1.
[  +0.056775] systemd[1]: [/usr/lib/systemd/system/lvm2-lvmetad.socket:9] Unknown lvalue 'RemoveOnStop' in section 'Socket'
[  +0.000675] systemd[1]: [/usr/lib/systemd/system/dm-event.socket:10] Unknown lvalue 'RemoveOnStop' in section 'Socket'
I'm not sure if LVM2 is referencing a feature that's not available in the default systemd version; AFAIK, my configuration is pretty much standard (default) regarding the pertinent components.
# rpm -qf /usr/lib/systemd/system/lvm2-lvmetad.socket 
lvm2-2.02.115-3.el7.x86_64

# yum info systemd
Installed Packages
Name        : systemd
Arch        : x86_64
Version     : 208
Release     : 20.el7_1.2
Size        : 11 M
Repo        : installed
From repo   : rhel-7-server-rpms

# multipath -l
Apr 24 03:48:25 | DM multipath kernel driver not loaded
Apr 24 03:48:25 | /etc/multipath.conf does not exist, blacklisting all devices.
Apr 24 03:48:25 | A default multipath.conf file is located at
Apr 24 03:48:25 | /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf
Apr 24 03:48:25 | You can run /sbin/mpathconf to create or modify /etc/multipath.conf
Apr 24 03:48:25 | DM multipath kernel driver not loaded
According to the bug report, RHEL 7.2 is planned to include systemd version 219 by default. This issue should be resolved then, if not sooner through a patch. Ultimately, this issue is not critical to the systems' operation.

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