fixed graph failure for VM names starting with digits
used "Validate filednames" Python stanza from docs to improve
clean_vm_name functions, helping graph creations for VM with names
starting with digits, like "150-121-Apache".
remember: each data source in a plugin must be identified by a field
name (in this case VM names). The characters must be [a-zA-Z0-9],
while the first character must be [a-zA-Z].
fixed graph failure for VM names starting with digits
used "Validate filednames" Python stanza from docs to improve clean_vm_name functions, helping graph creations for VM with names starting with digits, like "150-121-Apache".
remember: each data source in a plugin must be identified by a field name (in this case VM names). The characters must be [a-zA-Z0-9], while the first character must be [a-zA-Z].