Bug#1135601: apt: Add stale lock removal hint for users

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Package: apt
Severity: wishlist
Tags: patch

When apt encounters a stale lock file with no owning process,
it warns users not to remove it but gives no actionable advice.
This patch adds a clear hint with the exact command to run.

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<div dir=3D"ltr">Package: apt<br>Severity: wishlist<br>Tags: patch<br><br>W=
hen apt encounters a stale lock file with no owning process,<br>it warns us=
ers not to remove it but gives no actionable advice.<br>This patch adds a c=
lear hint with the exact command to run.</div>

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