script now installs necessary dependencies, creates secret files, prompts user to input mysql passwords, and create v2xhub user

updated script using comments from Paul

updated arm initialization script based on comments from reviewer on amd64 initialization script

updated line 29 to move back 1 directory so that it can get into mysql to run the v2xhub user creation script. line to go back directory was mistakenly removed during edits

updated to include cd .. (line 28) as it was mistakenly remove. before this update script wouldn't be able to run script to add v2xhub user

removed duplicated apt-get update lines leaving one at beginning and one at end

same changes as amd64, removed duplicate apt-get update lines

fixed typo