v1.8.7 RC release

Changes since previous release:
features:
kiss-vm: update to support slackware
kiss-vm: add support for slackware (not test yet)
kiss-vm: use 'run -nohup=' instead, 'run ... &'
kiss-vm: let user can specify network model,mac,...
kiss-vm: rename option --bus to --diskbus
kiss-vm: add -debug option for run()
kiss-vm: add --graphics= option and optimize code
kiss-vm: use --graphics= instead --vnc and --vnclisten options
kiss-vm: add --sound option and add default sound device
kiss-vm: add new sub-command: vm stat
kiss-vm: add --boot option
kiss-vm: workaround for --xml bug
kiss-vm: add -nohup parameter for run() function
kiss-vm: add --vncwait, --vncwait-after-install options
kiss-vm: add unbuffer after nohup
kiss-vm: reconnect once while virt-viewer exit
kiss-vm: improve code, avoid reboot fail. see also: virt-install(1) --noautoconsle and --wait=-1
kiss-vm: add sub-commnad vm-viewer
kiss-vm: add recommend pkglist in install_require()
kiss-vm: disable ipv6 in prepare libvirt function
kiss-vm: open virt-viewer while create vm in local GUI terminal
kiss-vm: add default --video=virtio option to virt-install
kiss-vm: fix changing boot disk bus type fail
kiss-vm: change the default cdrom bus type to sata
kiss-vm: add --xcdrom option
kiss-vm: still use default network as the first nic's network
kiss-vm: add --if-model=<e1000|rtl8139|virtio> option
kiss-vm: fix disk size setup while install from cdrom
bash-completion/vm: add completion for option -C
utils/fastesturl.sh: use ipv4 ping by default
utils: add cpu-temp-and-hz.sh
utils: add iommu-groups.sh
utils: add disable-ipv6.sh
utils/mount_vdisk.sh: fix mount_vdisk() fail on RHEL-9
utils: add args cmd for people who want to learn bash argparse
utils: add install-sbopkg.sh and update kiss-vm,ggv-install.sh

bug fixes:
Full Changelog: v1.8.6-Beta...v1.8.7