anaconda: use installer kernel parameters as default for installed system

This way if any kernel parameter was need to boot Qubes on particular
hardware, it will also be set to installed system

Fixes QubesOS/qubes-issues#1650

anaconda/pyanaconda/bootloader.py

@@ -243,12 +243,10 @@ class BootLoader(object):
     def stage2_format_types(self):
         return ["ext4", "ext3", "ext2"]
 
-    # this is so stupid...
-    global_preserve_args = ["speakup_synth", "apic", "noapic", "apm", "ide",
-                            "noht", "acpi", "video", "pci", "nodmraid",
-                            "nompath", "nomodeset", "noiswmd", "fips",
-                            "selinux", "biosdevname"]
-    preserve_args = []
+    global_no_preserve_args = ["inst.stage2", "root", "rescue",
+                               "rd.live.check", "ip", "repo", "ks",
+                               "rd.lvm", "rd.md", "rd.luks", "rd.dm",
+                               "rd.lvm.lv"]
 
     _trusted_boot = False
 
@@ -861,11 +859,10 @@ class BootLoader(object):
             self.boot_args.add("ifname=%s:%s" % (nic, hwaddr.lower()))
 
         #
-        # preservation of some of our boot args
-        # FIXME: this is stupid.
+        # preservation of most of our boot args
         #
-        for opt in self.global_preserve_args + self.preserve_args:
-            if opt not in flags.cmdline:
+        for opt in flags.cmdline.keys():
+            if opt in self.global_no_preserve_args:
                 continue
 
             arg = flags.cmdline.get(opt)