Delete newlines in base64 encoding

[ogrand]

trafficstars

Bosh Openstack cpi uses a POST request for instance creation, with body content user_data base64 encoded row containing newlines \n every 60 characters:

body: {
  "server": {
    "flavorRef": "s3.small.1",
    "name": "vm-d35f15af-9840-44be-8d95-a2b1e1ad5358",
    "imageRef": "97727138-8334-4188-9b1e-4x558599d99b",
    "user_data": "eyJzZXJ2ZXIiOnsibmFtZSI6InZtLWQzNWYxNWFmLTk4NDAtNDRiZS04ZDk1\nLWEyYjFlMWFkNTM1OCJ9LCJuZXR3b3JrcyI6eyJ0Zi1uZXQtY29hYi1kZXBs\ncy1pb

Recent upgrade (openstack 22.3) is less permissive for base64 decoding and refuses newlines \n inside base64 encoded value.

Reference: https://github.com/cloudfoundry/bosh-openstack-cpi-release/issues/255