memlockd-related kludges need to be adapted to systemd

memlockd isn’t running in Tails/Jessie. Likely our many sysvinit-specific kludges for memlockd need to be adapted. In Jessie, memlockd ships with a native systemd unit file.

Also:

we may want to use OOMScoreAdjust
we should find how to replace our usage of sendsigs.omit.d with systemd

Related issues

Related to #5821 (closed)

Original created by @intrigeri on 8259 (Redmine)

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