tests: Switch sys/kern/sysctl_security_jail_children to execenv=jail

Kyua skips tests based on the jail execution environment if a system is
built WITHOUT_JAIL. Thus, the test case does not need to

tests: Switch sys/kern/sysctl_security_jail_children to execenv=jail

Kyua skips tests based on the jail execution environment if a system is
built WITHOUT_JAIL. Thus, the test case does not need to handle it.

Reviewed by: markj
Approved by: markj (mentor)
Differential Revision: https://reviews.freebsd.org/D47105

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tests: move sysctl_security_jail_children.sh to the right directory