Failed to install system updates: Test Transaction Errors: libspf2 conflicts with psa-spf2

Symptoms

Updates installation fails:

PLESK_ERROR: Running Transaction Check
Fatal error during packages installation: Test Transaction Errors: file /usr/lib64/libspf2.so.2.1.0 from install of libspf2-1.2.10-5.20150405gitd57d79fd.el7.x86_64 conflicts with file from package psa-spf2-1.2.9-15072015.x86_64 YumTestTransactionError: Test Transaction Errors: file /usr/lib64/libspf2.so.2.1.0 from install of libspf2-1.2.10-5.20150405gitd57d79fd.el7.x86_64 conflicts with file from package psa-spf2-1.2.9-15072015.x86_64 The Yum utility failed to install the required packages.
Attention! Your software might be inoperable. 

Old version of the package psa-spf2 is installed on the system:

# rpm -qa | grep spf
psa-spf2-1.2.9-15072015.x86_64

According to /tmp/autoinstaller3.log, Plesk 17.5 MU #18 deployment was failed:

PLESK_INFO: Downloading file (175 of 188) PSA_17.5.3/microupdates/MU18/dist-rpm-CentOS-7-x86_64/spf: 0%
Downloading file (175 of 188) PSA_17.5.3/microupdates/MU18/dist-rpm-CentOS-7-x86_64/spf: 100% was finished.
Patching file (178 of 191) /usr/local/psa/handlers/hooks/spf
+ libspf2
libspf2-1.2.10-5.20150405gitd57d79fd.el7.x86_64  0.0 B/s |  66 kB    00:00    libspf2-1.2.10-5.20150405gitd57d79fd.el7.x86_64.rpm      |  66 kB    00:00
Fatal error during packages installation: Test Transaction Errors:  file /usr/lib64/libspf2.so.2.1.0 from install of libspf2-1.2.10-5.20150405gitd57d79fd.el7.x86_64 conflicts with file from package psa-spf2-1.2.9-15072015.x86_64
YumTestTransactionError: Test Transaction Errors:  file /usr/lib64/libspf2.so.2.1.0 from install of libspf2-1.2.10-5.20150405gitd57d79fd.el7.x86_64 conflicts with file from package psa-spf2-1.2.9-15072015.x86_64

Cause

libspf2 is required to be updated from 3rd-party repository.

Resolution

1. Connect to the server using SSH.
2. Erase the old package manually:

   # rpm -e --nodeps psa-spf2-1.2.9-15072015.x86_64

3. Disable 3rd-party repositories, as libspf2 can be updated with dependencies.
4. Download and install the actual version of the package (example for CentOS 7):

   # wget http://autoinstall.plesk.com/PSA_17.5.3/dist-rpm-CentOS-7-x86_64/contrib/psa-spf2-1.2.9.1-centos7.17031414.x86_64.rpm
   # yum localinstall psa-spf2-1.2.9.1-centos7.17031414.x86_64.rpm