sh/tests: Cut down builtins/read12.0 by 2 seconds

Since the test assumes a 250 ms response time, there is no need to delay
for 3 seconds. Instead, delay for the minimum possible 1 second.

Also, fix some assertions in builtins/read11.0 and builtins/read12.0. If
`set -e` is in effect, `foo` in `foo && bar` is considered tested and
therefore a failure does not cause the shell to exit.

Reviewed by:	bdrewery
Differential Revision:	https://reviews.freebsd.org/D55191

bin/sh/tests/builtins/read11.0

@@ -27,6 +27,7 @@ ts=$(date +%s%3N)
 read -t 0 v <&3 || r=$?
 te=$(date +%s%3N)
 kill -TERM "$!" || :
-[ "$r" -gt 128 ] && [ "$(kill -l "$r")" = ALRM ]
+[ "$r" -gt 128 ]
+[ "$(kill -l "$r")" = ALRM ]
 [ $((te-ts)) -lt 250 ]
 [ -z "$v" ]

bin/sh/tests/builtins/read12.0

@@ -1,5 +1,5 @@
-# Verify that `read -t 3 v` succeeds immediately if input is available
-# and times out after 3 s if not
+# Verify that `read -t 1 v` succeeds immediately if input is available
+# and times out after 1 s if not
 
 set -e
 
@@ -15,7 +15,7 @@ exec 3<fifo1
 v=original_value
 r=0
 ts=$(date +%s%3N)
-read -t 3 v <&3 || r=$?
+read -t 1 v <&3 || r=$?
 te=$(date +%s%3N)
 [ "$r" -eq 0 ]
 [ $((te-ts)) -lt 250 ]
@@ -24,9 +24,11 @@ te=$(date +%s%3N)
 v=original_value
 r=0
 ts=$(date +%s%3N)
-read -t 3 v <&3 || r=$?
+read -t 1 v <&3 || r=$?
 te=$(date +%s%3N)
 kill -TERM "$!" || :
-[ "$r" -gt 128 ] && [ "$(kill -l "$r")" = ALRM ]
-[ $((te-ts)) -gt 3000 ] && [ $((te-ts)) -lt 3250 ]
+[ "$r" -gt 128 ]
+[ "$(kill -l "$r")" = ALRM ]
+[ $((te-ts)) -ge 1000 ]
+[ $((te-ts)) -lt 1250 ]
 [ -z "$v" ]