Update safe_netrc from https://git.ligo.org/emfollow/safe-netrc

This brings support for the NETRC environment variable, which
makes it easier to isolate the unit tests from the users's
own netrc file.
10 jobs for master in 6 minutes and 59 seconds (queued for 7 minutes and 25 seconds)
latest
Status Job ID Name Coverage
  Build
passed #639910
build:debian:jessie

00:03:28

passed #639911
build:debian:stretch

00:01:42

passed #639909
build:el7

00:01:04

passed #639908
build:tarball

00:00:19

 
  Test
passed #639916
docs

00:01:04

passed #639917
syntax

00:00:45

failed #639912
test:python2.7

00:00:36

passed #639913
test:python3.5

00:00:45

passed #639914
test:python3.6

00:00:42

passed #639915
test:python3.7

00:00:39

 
Name Stage Failure
failed
test:python2.7 Test
ligo/gracedb/logging.py                         63     63     0%
ligo/gracedb/rest.py 952 952 0%
ligo/gracedb/utils.py 20 20 0%
----------------------------------------------------------------
TOTAL 1900 1898 1%

!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!
=========================== 1 error in 0.52 seconds ============================
ERROR: Job failed: exit code 1