Fixed missing import

Fixed missing import in boot-from-cdrom tool.
fixes QubesOS/qubes-issues#3421

qubesmanager/bootfromdevice.py

@@ -23,6 +23,7 @@ from . import utils
 from . import ui_bootfromdevice  # pylint: disable=no-name-in-module
 from PyQt4 import QtGui, QtCore  # pylint: disable=import-error
 from qubesadmin import tools
+from qubesadmin.tools import qvm_start
 
 
 class VMBootFromDeviceWindow(ui_bootfromdevice.Ui_BootDialog, QtGui.QDialog):
@@ -45,7 +46,6 @@ class VMBootFromDeviceWindow(ui_bootfromdevice.Ui_BootDialog, QtGui.QDialog):
         # populate buttons and such
         self.__init_buttons__()
 
-
     def reject(self):
         self.done(0)
 
@@ -62,7 +62,7 @@ class VMBootFromDeviceWindow(ui_bootfromdevice.Ui_BootDialog, QtGui.QDialog):
                 self.tr("ERROR!"),
                 self.tr("No file or block device selected; please select one."))
             return
-        tools.qvm_start.main(['--cdrom', cdrom_location, self.vm.name])
+        qvm_start.main(['--cdrom', cdrom_location, self.vm.name])
 
     def __init_buttons__(self):
         self.fileVM.setEnabled(False)
@@ -112,6 +112,7 @@ class VMBootFromDeviceWindow(ui_bootfromdevice.Ui_BootDialog, QtGui.QDialog):
 
 parser = tools.QubesArgumentParser(vmname_nargs=1)
 
+
 def main(args=None):
     args = parser.parse_args(args)
     vm = args.domains.pop()