virjsontest: switch DO_TEST_PARSE_FILE to use output files

Also switch the expected output of DO_TEST_PARSE_FILE to be
in a file, now that we demonstrated the input files match
the expected string representation.

Signed-off-by: Ján Tomko <jtomko@redhat.com>

tests/virjsondata/parse-Harder-out.json

@@ -0,0 +1,4 @@
+{"return":[{"filename":\
+"unix:/home/berrange/.libvirt/qemu/lib/tck.monitor,server",\
+"label":"charmonitor"},{"filename":"pty:/dev/pts/158",\
+"label":"charserial0"}],"id":"libvirt-3"}

tests/virjsondata/parse-NotSoSimple-out.json

@@ -0,0 +1,3 @@
+{"QMP":{"version":{"qemu":\
+{"micro":91,"minor":13,"major":0},\
+"package":" (qemu-kvm-devel)"},"capabilities":[]}}

tests/virjsondata/parse-Simple-out.json

@@ -0,0 +1 @@
+{"return":{},"id":"libvirt-1"}

tests/virjsondata/parse-VeryHard-out.json

@@ -0,0 +1,24 @@
+{"return":[{"name":"quit"},{"name":\
+"eject"},{"name":"change"},{"name":"screendump"},\
+{"name":"stop"},{"name":"cont"},{"name":\
+"system_reset"},{"name":"system_powerdown"},\
+{"name":"device_add"},{"name":"device_del"},\
+{"name":"cpu"},{"name":"memsave"},{"name":\
+"pmemsave"},{"name":"migrate"},{"name":\
+"migrate_cancel"},{"name":"migrate_set_speed"},\
+{"name":"client_migrate_info"},{"name":\
+"migrate_set_downtime"},{"name":"netdev_add"},\
+{"name":"netdev_del"},{"name":"block_resize"},\
+{"name":"balloon"},{"name":"set_link"},{"name":\
+"getfd"},{"name":"closefd"},{"name":"block_passwd"},\
+{"name":"set_password"},{"name":"expire_password"},\
+{"name":"qmp_capabilities"},{"name":\
+"human-monitor-command"},{"name":"query-version"},\
+{"name":"query-commands"},{"name":"query-chardev"},\
+{"name":"query-block"},{"name":"query-blockstats"},\
+{"name":"query-cpus"},{"name":"query-pci"},{"name":\
+"query-kvm"},{"name":"query-status"},{"name":\
+"query-mice"},{"name":"query-vnc"},{"name":\
+"query-spice"},{"name":"query-name"},{"name":\
+"query-uuid"},{"name":"query-migrate"},{"name":\
+"query-balloon"}],"id":"libvirt-2"}