shell: rename bash directory to shell

Signed-off-by: John Else <john.else@citrix.com>
shell: add .profile

Signed-off-by: John Else <john.else@citrix.com>
shell: set environment variables in .profile

Signed-off-by: John Else <john.else@citrix.com>
shell: Don't add ~/bin to path twice

Signed-off-by: John Else <john.else@citrix.com>