Remove unused flags and do not read flags from boot command line

These flags are not used by Anaconda anymore or not used in our
code at all.
Blivet is now also used outside Anaconda so we should not try to
parse kernel command line for flags and let Anaconda do it when it
makes sense.

blivet/flags.py

@@ -19,9 +19,6 @@
 # Red Hat Author(s): David Lehman <dlehman@redhat.com>
 #
 
-import shlex
-
-
 class Flags(object):
 
     def __init__(self):
@@ -47,7 +44,6 @@ def __init__(self):
             self.selinux = selinux.is_selinux_enabled()
 
         self.ibft = True
-        self.noiswmd = False
 
         self.gfs2 = True
 
@@ -81,9 +77,6 @@ def __init__(self):
         # (so far only for LUKS)
         self.discard_new = False
 
-        self.boot_cmdline = {}
-
-        self.update_from_boot_cmdline()
         self.allow_imperfect_devices = True
 
         # compression option for btrfs filesystems
@@ -99,20 +92,5 @@ def __init__(self):
         # Allow online filesystem resizes
         self.allow_online_fs_resize = False
 
-    def get_boot_cmdline(self):
-        with open("/proc/cmdline") as f:
-            buf = f.read().strip()
-            args = shlex.split(buf)
-            for arg in args:
-                (opt, _equals, val) = arg.partition("=")
-                if val:
-                    self.boot_cmdline[opt] = val
-
-    def update_from_boot_cmdline(self):
-        self.get_boot_cmdline()
-        self.multipath = "nompath" not in self.boot_cmdline
-        self.noiswmd = "noiswmd" in self.boot_cmdline
-        self.gfs2 = "gfs2" in self.boot_cmdline
-
 
 flags = Flags()