ZTS: Wait for free space between quota tests

And in removal tests, sync the specific pool we are waiting on.

Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10146

tests/zfs-tests/tests/functional/quota/quota_001_pos.ksh

@@ -62,7 +62,8 @@ function cleanup
 	# pool, otherwise next test will fail trying to set a
 	# quota which is less than the space used.
 	#
-	sleep 5
+	wait_freeing $TESTPOOL
+	sync_pool $TESTPOOL
 }
 
 log_onexit cleanup

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

@@ -61,6 +61,9 @@ function cleanup
 
 	[[ -e $TESTDIR/$TESTFILE2 ]] && \
             log_must rm $TESTDIR/$TESTFILE2
+
+	wait_freeing $TESTPOOL
+	sync_pool $TESTPOOL
 }
 
 log_onexit cleanup

tests/zfs-tests/tests/functional/quota/quota_003_pos.ksh

@@ -61,11 +61,12 @@ function cleanup
 	    log_must rm $TESTDIR1/$TESTFILE1
 
 	#
-        # Need to allow time for space to be released back to
-        # pool, otherwise next test will fail trying to set a
-        # quota which is less than the space used.
-        #
-        sleep 5
+	# Need to allow time for space to be released back to
+	# pool, otherwise next test will fail trying to set a
+	# quota which is less than the space used.
+	#
+	wait_freeing $TESTPOOL
+	sync_pool $TESTPOOL
 }
 
 log_onexit cleanup

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

@@ -62,6 +62,9 @@ function cleanup
 
 	[[ -e $TESTDIR1/$TESTFILE2 ]] && \
             log_must rm $TESTDIR1/$TESTFILE2
+
+	wait_freeing $TESTPOOL
+	sync_pool $TESTPOOL
 }
 
 log_onexit cleanup

tests/zfs-tests/tests/functional/removal/removal.kshlib

@@ -34,7 +34,7 @@ function wait_for_removal # pool
 	# The pool state changes before the TXG finishes syncing; wait for
 	# the removal to be completed on disk.
 	#
-	sync_pool
+	sync_pool $pool
 
 	log_must is_pool_removed $pool
 	return 0