Fix tests use /etc/motd after r350184 by using an always existing file

Sponsored by: The FreeBSD Foundation

Add an auxiliary subroutine to generate some events for testing

This test is also timeout on a quiet system because there is nobody triggering
read probefunc while test execution.

Reviewed by: gnn,

Add an auxiliary subroutine to generate some events for testing

This test is also timeout on a quiet system because there is nobody triggering
read probefunc while test execution.

Reviewed by: gnn, markj, ngie
Differential Revision: https://reviews.freebsd.org/D11731

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This commit was generated by cvs2svn to compensate for changes in r178476,
which included commits to RCS files with non-trunk default branches.