Fix build after recent merges into the zfsd branch

cddl/zfs/include/testenv.kshlib
cddl/zfs/tests/cli_root/zpool_import/zpool_import.kshlib
cddl/zfs/tests/cli_user/misc/setup_basic.ksh
Add missing files

cddl/zfs/bin/Makefile
cddl/zfs/tests/threadsappend/Makefile
cddl/zfs/tests/txg_integrity/Makefile
s/LDADD/LIBADD

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