fstests: add punch, collapse, insert, zero test groups

Define test groups for those tests which have _require_xfs_io_command
for punch, collapse, insert, and zero.  This makes it easier to
exclude tests that use one of these fallocate commands.  Or if you
want to specifically test for those fallocate commands you can do
this.

This obviates an out-of-tree xfstests patch I maintain which used an
XFS_IO_AVOID environment variable to suppress running tests that use
punch, collapse, insert, etc.  This was rejected because of the
claim that it could be done using groups.  So this commit is in
response to those upstream comments.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/ext4/group

@@ -3,7 +3,7 @@
 # - do not start group names with a digit
 # - comment line before each group is "new" description
 #
-001 auto prealloc quick
+001 auto prealloc quick zero
 002 auto quick prealloc
 003 auto quick
 004 auto dump
@@ -17,7 +17,7 @@
 012 fuzzers
 013 fuzzers
 014 fuzzers
-015 fuzzers
+015 fuzzers punch
 016 fuzzers
 017 fuzzers
 018 fuzzers