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Description of problem:
The current version of tuned does not support assignment modifiers as other plugins do for the sysctl plugin.

How reproducible:
Always

Steps to Reproduce:
1. systemctl stop tuned
2. Verify that `sysctl -n kernel.pid_max` is lower than 131072
32768
3. Use
[sysctl]
kernel.pid_max=>131072
in one of the tuned profiles.

4. Make the tuned profile active (+systemctl start tuned).
5. Query sysctl -n kernel.pid_max

Actual results:
32768

Expected results:
131072

Additional info:
Fixed upstream by 
https://github.com/redhat-performance/tuned/commit/90c371fc00df87ff5cf89616867ea7ba4348eef5

This is regular bug and the patch is already upstream:
https://github.com/redhat-performance/tuned/commit/90c371fc00df87ff5cf89616867ea7ba4348eef5

Backport seems to be easy. From the developer point of view I do not see any problem with the z-stream.

Functionality verified with tuned-2.10.0-0.1.rc1.el7.noarch, works as expected. Thank you.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3172