Fix ELS kernels detection and add TuxCare and ELevate keys

[andrewlukoshko]

EVR of kernel packages in Leapp 0.16.0 is not correct as Release contains Arch as well.
This makes incorrect comparison of kernel versions:
3.10.0-1160.119.1.el7.x86_64 > 3.10.0-1160.119.1.el7.tuxcare.els1.x86_64

This PR fixes this as well as adds TuxCare key fingerprint (used to sign ELS packages) and ELevate key fingerprint as well.

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[yuravk]

Looks good.