[LNT] Python 3 support: requests.response as text

Summary:
lnt admin rm-machine command prints output from the REST API for
deleting machine line by line using requests.response's iter_lines()
method. However in Python 3 this method returns data by default and
printing expects a string. This commit uses the text attribute for
requests.response and iterate over the lines with splitlines.

Reviewers: cmatthews, hubert.reinterpretcast, kristof.beyls, leandron, PrzemekWirkus

Reviewed By: PrzemekWirkus

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D68985

Author: Thomas Preud'homme

lnt/lnttool/admin.py

@@ -186,7 +186,7 @@ def action_rm_machine(config, machine):
            .format(machine=machine, **config.dict))
     response = config.session.delete(url, stream=True)
     _check_response(response)
-    for line in response.iter_lines():
+    for line in response.text.splitlines():
         sys.stdout.write(line + '\n')
         sys.stdout.flush()