Add deploypkg plugin to open-vm-tools

This adds the deploypkg plugin to open-vm/tools. I have created a branch of open-vm-tools based at version 9.4.6 and added deploypkg to it. This pull request is to use open-vm-tools from that branch (see EGIT_REPO_URI and EGIT_BRANCH). It also adds the package libmspack because deploypkg depends on it.

Here is a short test (just after first boot) that shows that the plugin will be loaded. I still need to add the library path, this is another issue.

core@localhost ~ $ sudo sh -c "echo /usr/share/oem/lib64 > /etc/ld.so.conf.d/oem.conf"
core@localhost ~ $ sudo ldconfig
core@localhost ~ $ sudo systemctl restart vmtoolsd
core@localhost ~ $ ps awx | grep vm
  236 ?        S<     0:00 [vmw_pvscsi_wq_1]
  556 ?        Ssl    0:00 /usr/share/oem/bin/vmtoolsd
  574 pts/0    S+     0:00 grep --colour=auto vm
core@localhost ~ $ sudo lsof -p 556 | grep -i deploy
vmtoolsd 556 root  mem    REG                8,6    26504    79 /usr/share/oem/lib64/libDeployPkg.so.0.0.0
vmtoolsd 556 root  mem    REG                8,6    14256    96 /usr/share/oem/lib64/open-vm-tools/plugins/vmsvc/libdeployPkgPlugin.so
core@localhost ~ $ 

Use variables instead of "alpha".