Cannot upload io.StringIO with non-ASCII characters

[ilia1243]

Steps to reproduce:

1. Create template files/test_cm.yaml.j2

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-cm
data:
  cluster_name: "{{ cluster_name }}"
  unicode_symbol: "😀"

2. Create custom plugin in inventory

plugins:
  ...
  my_plugin:
    install: true
    installation:
      procedures:
        - template:
            source: files/test_cm.yaml.j2

3. Run install --tasks deploy.plugins

AR: fails with size mismatch in put! 121 != 118, see paramiko/paramiko#1133

The problem is likely actual for any upload of io.StringIO instance.

Possible solution:

When uploading of any text, manually encode it with 'utf-8' and upload as io.BytesIO

If the text is obtained from file on Windows deployer, it will need to decode it first with the same 'utf-8' to not lose the utf-8 symbols.

In other words, it is necessary to introduce new requirement for encoding of input text files and always open for reading and writing with 'utf-8' and always upload as io.BytesIO.

Prototype: eedfbf9