Fix shebangs and execute bit of test scripts.

Since we don't have /usr/bin/ksh, use a generic way of specifying
ksh. Some of the tests only run with ksh93, so use this shell
for these tests. Two of

Fix shebangs and execute bit of test scripts.

Since we don't have /usr/bin/ksh, use a generic way of specifying
ksh. Some of the tests only run with ksh93, so use this shell
for these tests. Two of the tests don't have the execute bit set,
so fix this, too.

Reviewed by: markj@
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D16270

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Fix ping(8) and ping6(8) usage in a couple of ip provider tests, and
update expected test output to reflect differences in default TTL and
payload length.

MFC after: 1 week

Port most of the DTrace tests to FreeBSD.

Sponsored by: The FreeBSD Foundation

MFV OpenSolaris DTrace userland bits.