merge PostgreSQL to tools.func Installer (#4752)

* Update tools.func

* Merge PostgreSQL to tools.func Installer

install/netbox-install.sh

@@ -17,7 +17,6 @@ msg_info "Installing Dependencies"
 $STD apt-get install -y \
   apache2 \
   redis-server \
-  postgresql \
   build-essential \
   libxml2-dev \
   libxslt1-dev \
@@ -27,6 +26,8 @@ $STD apt-get install -y \
   zlib1g-dev
 msg_ok "Installed Dependencies"
 
+PG_VERSION="16" install_postgresql
+
 msg_info "Installing Python"
 $STD apt-get install -y \
   python3 \