[LNT] Python 3 support: update dependencies

Update dependencies to fix 2 python 3 related issues:
- progressbar does not support Python 3 (use progressbar2 instead)
- PyYAML 3.12 fails to install with Python 3.7 (issue #126, use
  PyYAML 3.13 instead)

Reviewers: cmatthews, hubert.reinterpretcast, kristof.beyls

Reviewed By: hubert.reinterpretcast

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D68126


git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@373859 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Thomas Preud'homme

requirements.client.txt

@@ -15,7 +15,7 @@ WTForms==2.0.2
 Flask-WTF==0.12
 typing
 click==6.7
-pyyaml==3.12
+pyyaml==3.13
 requests
 future
 -e svn+https://llvm.org/svn/llvm-project/llvm/trunk/utils/lit/#egg=lit

requirements.server.txt

@@ -3,4 +3,4 @@
 psycopg2==2.7
 # Flask 0.11 does not work yet.
 gunicorn==18.0
-progressbar==2.3
+progressbar2