Update default releasever to Fedora 29 (rawhide)

There was Fedora 25 which is now unsupported.

src/pylorax/cmdline.py

@@ -279,7 +279,7 @@ def lmc_parser(dracut_default=""):
                         help="Substituted for @TITLE@ in bootloader config files")
     parser.add_argument("--project", default="Linux",
                         help="substituted for @PROJECT@ in bootloader config files")
-    parser.add_argument("--releasever", default="25",
+    parser.add_argument("--releasever", default="29",
                         help="substituted for @VERSION@ in bootloader config files")
     parser.add_argument("--volid", default=None, help="volume id")
     parser.add_argument("--squashfs_args",

src/sbin/livemedia-creator

@@ -342,7 +342,7 @@ def squashfs_args(opts):
 
 def make_appliance(disk_img, name, template, outfile, networks=None, ram=1024,
                    vcpus=1, arch=None, title="Linux", project="Linux",
-                   releasever="25"):
+                   releasever="29"):
     """
     Generate an appliance description file
 
@@ -356,7 +356,7 @@ def make_appliance(disk_img, name, template, outfile, networks=None, ram=1024,
     :param str arch: CPU architecture. Default is 'x86_64'
     :param str title: Title, passed to template. Default is 'Linux'
     :param str project: Project, passed to template. Default is 'Linux'
-    :param str releasever: Release version, passed to template. Default is 25
+    :param str releasever: Release version, passed to template. Default is 29
     """
     if not (disk_img and template and outfile):
         return None

src/sbin/lorax

@@ -137,7 +137,7 @@ def main():
 
 def get_dnf_base_object(installroot, sources, mirrorlists=None, repos=None,
                         enablerepos=None, disablerepos=None,
-                        tempdir="/var/tmp", proxy=None, releasever="21",
+                        tempdir="/var/tmp", proxy=None, releasever="29",
                         cachedir=None, logdir=None, sslverify=True):
     """ Create a dnf Base object and setup the repositories and installroot