virtinstall: fix regression with --boot and no install method

Anything passed to --boot should imply --install no_install=yes
in the absence of other --install options. This is historically
what we've done but we regressed in 4.1.0

Resolves: https://github.com/virt-manager/virt-manager/issues/426

Signed-off-by: Cole Robinson <crobinso@redhat.com>

tests/test_cli.py

@@ -967,6 +967,7 @@ c.add_valid("--os-variant generic --pxe --ram 16", grep="Requested memory 16 MiB
 c.add_valid("--os-variant winxp --ram 32 --cdrom %(EXISTIMG1)s", grep="32 MiB is less than the recommended 64 MiB")  # Windows. Catch memory warning
 c.add_valid("--osinfo generic --pxe --autostart")  # --autostart flag
 c.add_valid("--cdrom %(EXISTIMG2)s --os-variant win2k3 --print-step 2")  # HVM windows install, print 3rd stage XML
+c.add_valid("--memory 512 --osinfo generic --boot cdrom")  # --boot XXX should imply --install no_install
 c.add_compare("--location location=%(TREEDIR)s --initrd-inject virt-install --extra-args ks=file:/virt-install", "initrd-inject")  # initrd-inject
 c.add_compare("--cdrom http://example.com/path/to/some.iso --os-variant detect=yes,require=no", "cdrom-url")
 c.add_compare("--pxe --print-step all --os-variant none", "simple-pxe")  # Diskless PXE install

virtinst/virtinstall.py

@@ -433,7 +433,7 @@ def build_installer(options, guest, installdata):
         no_install = True
     elif options.import_install:
         no_install = True
-    elif options.boot:
+    elif options.boot_was_set:
         no_install = True
     elif options.cloud_init:
         no_install = True
@@ -645,6 +645,7 @@ def _build_options_guest(conn, options):
 def build_guest_instance(conn, options):
     installdata = cli.parse_install(options.install)
     osdata = cli.parse_os_variant(options.os_variant or installdata.os)
+    options.boot_was_set = bool(options.boot)
 
     if options.reinstall:
         dummy1, guest, dummy2 = cli.get_domain_and_guest(conn, options.reinstall)