tests: Fix virsh-snapshot/checkpoint without readline-devel

readline-devel is an optional build dependency; when it is not
present, the output of 'virsh <<EOF ... EOF' is different in that the
input provided by the user is not echoed, and prompts become
interleaved on the same line as actual output, which in turn causes
the sed doing prompt filtering to mess up:

| ./virsh-snapshot
| --- exp	2019-07-31 18:42:31.107399428 -0300
| +++ out.cooked	2019-07-31 18:42:31.108399437 -0300
| @@ -1,8 +1,3 @@
| -
| -
| -Domain snapshot s3 created from 's3.xml'
| -Domain snapshot s2 created from 's2.xml'
| -Name:           s2
|  Domain:         test
|  Current:        yes
|  State:          running

Maybe we should fix virsh in interactive mode to echo regardless of
whether readline-devel was used, but the quicker fix is to make the
test use 'virsh "..."' rather than reading its input from stdin.
Reported-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: NEric Blake <eblake@redhat.com>
Tested-by: NDaniel Henrique Barboza <danielhb413@gmail.com>

tests/virsh-checkpoint

@@ -140,7 +140,7 @@ EOF
 compare exp err || fail=1
 
 # Restore state with redefine
-$abs_top_builddir/tools/virsh -c test:///default >out 2>err <<EOF || fail=1
+$abs_top_builddir/tools/virsh -c test:///default >out 2>err '
   # Redefine must be in topological order; this will fail
   checkpoint-create test --redefine c2.xml
   echo --err marker
@@ -149,7 +149,7 @@ $abs_top_builddir/tools/virsh -c test:///default >out 2>err <<EOF || fail=1
   checkpoint-create test --redefine c2.xml
   checkpoint-list test --leaves --name
   checkpoint-info test c2
-EOF
+' || fail=1
 
 cat <<\EOF > exp || fail=1
 
@@ -165,8 +165,7 @@ Children:       0
 Descendants:    0
 
 EOF
-sed '1,/^virsh #/d; /virsh #/d' < out > out.cooked || fail=1
-compare exp out.cooked || fail=1
+compare exp out || fail=1
 
 cat <<EOF > exp || fail=1
 error: invalid argument: parent c3 for moment c2 not found

tests/virsh-snapshot

@@ -191,7 +191,7 @@ EOF
 compare exp err || fail=1
 
 # Restore state with redefine
-$abs_top_builddir/tools/virsh -c test:///default >out 2>err <<EOF || fail=1
+$abs_top_builddir/tools/virsh -c test:///default >out 2>err '
   # Redefine must be in topological order; this will fail
   snapshot-create test --redefine s2.xml --validate
   echo --err marker
@@ -199,7 +199,7 @@ $abs_top_builddir/tools/virsh -c test:///default >out 2>err <<EOF || fail=1
   snapshot-create test --redefine s3.xml --validate
   snapshot-create test --redefine s2.xml --current --validate
   snapshot-info test --current
-EOF
+' || fail=1
 
 cat <<\EOF > exp || fail=1
 
@@ -217,8 +217,7 @@ Descendants:    0
 Metadata:       yes
 
 EOF
-sed '1,/^virsh #/d; /virsh #/d' < out > out.cooked || fail=1
-compare exp out.cooked || fail=1
+compare exp out || fail=1
 
 cat <<EOF > exp || fail=1
 error: invalid argument: parent s3 for moment s2 not found