ash: copy three tests from hush_test/hush-signals/*

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-signals/catch.right

@@ -0,0 +1,5 @@
+sending USR2
+caught
+sending USR2
+sending USR2
+User defined signal 2

shell/ash_test/ash-signals/catch.tests

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+# avoid ugly warnings about signals not being caught
+trap ":" USR1 USR2
+
+"$THIS_SH" -c '
+trap "echo caught" USR2
+echo "sending USR2"
+kill -USR2 $$
+
+trap "" USR2
+echo "sending USR2"
+kill -USR2 $$
+
+trap "-" USR2
+echo "sending USR2"
+kill -USR2 $$
+
+echo "not reached"
+'
+
+trap "-" USR1 USR2

shell/ash_test/ash-signals/signal_read2.right

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+Hangup
+Done:129

shell/ash_test/ash-signals/signal_read2.tests

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+$THIS_SH -c '
+(sleep 1; kill -HUP $$) &
+while true; do
+	read ignored
+done
+'
+echo "Done:$?"

shell/ash_test/ash-signals/subshell.right

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+trap -- '' HUP
+trap -- '' QUIT
+trap -- '' SYS
+Ok
+trap -- '' HUP
+trap -- '' QUIT
+trap -- '' SYS
+Ok
+trap -- '' HUP
+trap -- '' QUIT
+trap -- '' SYS
+Ok
+trap -- '' HUP
+trap -- '' QUIT
+trap -- '' SYS
+Ok
+trap -- '' HUP
+trap -- '' QUIT
+trap -- '' SYS
+Terminated
+Done

shell/ash_test/ash-signals/subshell.tests

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+# Non-empty traps should be reset in subshell
+
+# HUP is special in interactive shells
+trap '' HUP
+# QUIT is always special
+trap '' QUIT
+# SYS is not special
+trap '' SYS
+# WINCH is harmless
+trap 'bad: caught WINCH' WINCH
+# With TERM we'll check whether it is reset
+trap 'bad: caught TERM'  TERM
+
+(trap; "$THIS_SH" -c 'kill -HUP   $PPID'; echo Ok)
+(trap; "$THIS_SH" -c 'kill -QUIT  $PPID'; echo Ok)
+(trap; "$THIS_SH" -c 'kill -SYS   $PPID'; echo Ok)
+(trap; "$THIS_SH" -c 'kill -WINCH $PPID'; echo Ok)
+(trap; "$THIS_SH" -c 'kill -TERM  $PPID'; echo Bad: TERM is not reset)
+echo Done