Fix sysctl handling mechanism on kdump-tools
Currently we don't delete the temporary files created by the sysctl handling mechanism on kdump-tools. This small patch only fixes that.
2 important things to notice:
(a) It's only a single patch, not sure how to limit that on the MR - it pulls a bunch of patches together as well.
(b) It's on top of the kdump memory estimator MR [0] on purpose - it touches the same portion of code, so would cause conflicts. At the same time, I feel the importance of this fix is way smaller than have the memory estimator merged, so hope to have reviews on that MR before this one gets merged.
Thanks in advance for the reviews!
[0] !1