Convert existing tests to use new runner

tests/normal-use/string-7-is-null/query.sql

@@ -0,0 +1,2 @@
+select rowid, bool_0, quote(binary_10) FROM dataset where string_7 is null;
+.output

tests/normal-use/string-7-is-null/results.txt

@@ -0,0 +1,49 @@
+11||NULL
+12||NULL
+13||NULL
+14||NULL
+15||NULL
+16||NULL
+17||NULL
+18||NULL
+19||NULL
+20||NULL
+22|0|X'15'
+24|0|X'17'
+26|0|X'19'
+28|0|X'1B'
+30|0|X'1D'
+32|0|X'1F'
+34|0|X'21'
+36|0|X'23'
+38|0|X'25'
+40|0|X'27'
+42|0|X'29'
+44|0|X'2B'
+46|0|X'2D'
+48|0|X'2F'
+50|0|X'31'
+52|0|X'33'
+54|0|X'35'
+56|0|X'37'
+58|0|X'39'
+60|0|X'3B'
+62|0|X'3D'
+64|0|X'3F'
+66|0|X'41'
+68|0|X'43'
+70|0|X'45'
+72|0|X'47'
+74|0|X'49'
+76|0|X'4B'
+78|0|X'4D'
+80|0|X'4F'
+82|0|X'51'
+84|0|X'53'
+86|0|X'55'
+88|0|X'57'
+90|0|X'59'
+92|0|X'5B'
+94|0|X'5D'
+96|0|X'5F'
+98|0|X'61'