Bug 1476273

Description of problem:
When using grubby to remove a specific LVM parameter (rd.lvm.lv) from the file /etc/grub2.cfg, it removes an incorrect one. Even if a non-existing combination of VG/LV is given to the argument "--remove-args=rd.lvm.lv=vg/lv", it removes a parameter of type "rd.lvm.lv" instead of giving a warning and not modifying the /etc/grub2.cfg.

Version-Release number of selected component (if applicable):
grubby-8.28-21.el7_3.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Check the occurrences of the parameter 'rd.lvm.lv' from the /etc/grub2.cfg file:

[root@fvm-rhel-7-3-35 ~]# egrep -o 'rd.lvm.lv=\S+' /etc/grub2.cfg | sort -u
rd.lvm.lv=r7vg/root_lv
rd.lvm.lv=r7vg/swap_lv

2. Use grubby to remove the parameter 'rd.lvm.lv' which references to the swap LV:

[root@fvm-rhel-7-3-35 ~]# grubby --update-kernel=ALL --remove-args=rd.lvm.lv=r7vg/swap_lv

3. Check the result of what grubby has deleted:

[root@fvm-rhel-7-3-35 ~]# egrep -o 'rd.lvm.lv=\S+' /etc/grub2.cfg | sort -u
rd.lvm.lv=r7vg/swap_lv


Actual results:
It deletes a wrong parameter 'rd.lvm.lv' from the kernel boot line in the file /etc/grub2.cfg

Expected results:
Grubby should delete only the parameter indicated with the option "--remove-args=vg/lv" or give a warning if it doesn't find it in any of the kernel boot lines from the file /etc/grub2.cfg.

Additional info:
N/A