[Bugfix:System] Fix install_system for initial vagrant up (#5994)
[Bugfix:System] Fix install_system for initial vagrant up (#5994)

* initial work

* only clobber www-data file

Co-authored-by: Shail Patel <dd393f241fc3599e147c655cb9cffcf3e233bebe@Shails-MacBook-Pro.local>
RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty