Recover from ReaR(Relax and Recover) does not work normally in RHEL 7.3 while it works well in RHEL 7.2.

Issue

• Recover from ReaR does not work normally in RHEL 7.3 while it works well in RHEL 7.2.
• Following error is displayed while doing the ReaR recover from running 'rear -v -d recover'.

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Installing GRUB2 boot loader

WARNING ! For this system
RedHatEnterpriseServer/7 on Linux-i386 (based on Fedora/7/i386)
there is no code to install a boot loader on the recovered system or the code
that we have failed to install the boot loader correctly.

Please contribute this code to the Relax-and-Recover project. To do so
please take a look at the scripts in /usr/share/rear/finalize,
for an example you can use the script for Fedora (and RHEL/CentOS/SL) in
/usr/share/rear/finalize/Linux-i386/21_install_grub.sh or
/usr/share/rear/finalize/Linux-i386/22_install_grub2.sh

-------------------- ATTENTION ATTENTION ATTENTION --------------------
|                                                                     |
|          IF YOU DO NOT INSTALL A BOOT LOADER MANUALLY,              |
|                                                                     |
|          THEN YOUR SYSTEM WILL N O T BE ABLE TO BOOT !              |
|                                                                     |
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You can use 'chroot /mnt/local bash --login' to access the recovered system.
Please remember to mount /proc before trying to install a boot loader.

Finished recovering your system. You can explore it under '/mnt/local'.
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