Enable quota_002_pos, quota_004_pos and quota_005_pos

In this test the 'ls -ls' command was used to print testfile size in
blocks.  Because the environment variable BLOCK_SIZE was set
the 'ls -ls' command detected this and output its block count as the
number of 8192 blocks.  Rather than change the variable name
the -k was was added to force ls to return 1k blocks.  This has the
additional advantage of behaving consistently across platforms.

For additional details on GNU 'ls' behavior regarding block size:

https://www.gnu.org/software/coreutils/manual/html_node/Block-size.html

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: yuxiang <guo.yong33@zte.com.cn>
Closes #5269

tests/zfs-tests/tests/functional/quota/quota.kshlib

@@ -60,9 +60,9 @@ function fill_quota
         [[ $zret -ne $EDQUOT ]] && \
             log_fail "Returned error code: $zret. Expected: $EDQUOT."
 
-	typeset -i file_size=`$LS -ls $MNTPT/$TESTFILE1 | $AWK '{ print $1 }'`
+	typeset -i file_size=`$LS -lsk $MNTPT/$TESTFILE1 | $AWK '{ print $1 }'`
 	typeset -i limit=0
-	(( file_size = file_size * 512 ))
+	(( file_size = file_size * 1024 ))
 	(( limit = QUOTA_VALUE + TOLERANCE ))
 	(( file_size > limit )) && \
 	    log_fail "File was created larger than the quota value, aborting!!!"

tests/zfs-tests/tests/functional/quota/quota_002_pos.ksh

@@ -42,7 +42,7 @@
 # 1) Apply quota to the ZFS file system
 # 2) Exceed the quota
 # 3) Attempt to write another file
-# 4) Verify the attempt fails with error code 49 (EDQUOTA)
+# 4) Verify the attempt fails with error code EDQUOTA (linux 122, others 49)
 #
 #
 

tests/zfs-tests/tests/functional/quota/quota_004_pos.ksh

@@ -42,7 +42,7 @@
 # 1) Apply quota to the ZFS file system dataset
 # 2) Exceed the quota
 # 3) Attempt to write another file
-# 4) Verify the attempt fails with error code 49 (EDQUOTA)
+# 4) Verify the attempt fails with error code EDQUOTA (linux 122, others 49)
 #
 #