builder: templates: Add centos-7.7.

builder/templates/centos-7.7.index-fragment

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+[centos-7.7]
+name=CentOS 7.7
+osinfo=centos7.7
+arch=x86_64
+file=centos-7.7.xz
+checksum[sha512]=0cc4d5a5ddff9d6dc11ddbf0161368630f4517cc4a12ac449619a0cdb7825b0b16973226617574ea8dc60338094f94db6a34d7fb7ee2906f0ef0b05215e8912d
+format=raw
+size=6442450944
+compressed_size=353990508
+expand=/dev/sda4
+notes=CentOS 7.7
+ 
+ This CentOS image contains only unmodified @Core group packages.
+ 
+ This template was generated by a script in the libguestfs source tree:
+     builder/templates/make-template.ml
+ Associated files used to prepare this template can be found in the
+ same directory.
+

builder/templates/centos-7.7.ks

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+# Kickstart file for centos-7.7
+# Generated by libguestfs.git/builder/templates/make-template.ml
+
+install
+text
+reboot
+lang en_US.UTF-8
+keyboard us
+network --bootproto dhcp
+rootpw builder
+firewall --enabled --ssh
+timezone --utc America/New_York
+selinux --enforcing
+
+bootloader --location=mbr --append="console=tty0 console=ttyS0,115200 rd_NO_PLYMOUTH"
+
+zerombr
+clearpart --all --initlabel --disklabel=gpt
+autopart --type=plain
+
+# Halt the system once configuration has finished.
+poweroff
+
+%packages
+@core
+%end
+
+# EOF

builder/templates/centos-7.7.virt-install-cmd

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+# This is the virt-install command which was used to create
+# the virt-builder template 'centos-7.7'
+# NB: This file is generated for documentation purposes ONLY!
+# This script was never run, and is not intended to be run.
+
+'virt-install' \
+    '--transient' \
+    '--name=tmp-sbpyaejm' \
+    '--ram=2048' \
+    '--arch=x86_64' \
+    '--cpu=host' \
+    '--vcpus=4' \
+    '--os-variant=centos7.0' \
+    '--initrd-inject=centos-7.7.ks' \
+    '--extra-args=ks=file:/centos-7.7.ks  console=tty0 console=ttyS0,115200 rd_NO_PLYMOUTH' \
+    '--disk=/home/rjones/d/libguestfs/builder/templates/tmp-sbpyaejm.img,size=6,format=raw' \
+    '--location=http://mirror.centos.org/centos-7/7/os/x86_64/' \
+    '--serial=pty' \
+    '--nographics' 
+