ash: add tests for failures of the exec and command builtins

The exec builtin should return an exit status of 127 if the command
can't be found.  It doesn't:  it returns 2.

If the command builtin is used to source a script that runs a second
script that doesn't exist ash should issue an error.  Instead it seg
faults.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-misc/command2.right

@@ -0,0 +1,2 @@
+test1
+./command2.tests: ./test1.sh: line 1: ./test2.sh: Permission denied

shell/ash_test/ash-misc/command2.tests

@@ -0,0 +1,6 @@
+echo "echo test1; ./test2.sh" >test1.sh
+echo "echo test2" >test2.sh
+
+command . ./test1.sh
+
+rm -f test1.sh test2.sh

shell/ash_test/ash-misc/exec.right

@@ -0,0 +1,2 @@
+./exec.tests: exec: line 2: ./test1.sh: not found
+127

shell/ash_test/ash-misc/exec.tests

@@ -0,0 +1,3 @@
+rm -f test1.sh
+(exec ./test1.sh)
+echo $?