explicit Python 2.7 virtualenv

[tpltnt]

Hi there,

I added Python 2.7 as an explicit option to the virtualenv command. I tripped over it and ended up with a non 2.7 version which resulted in more issues down the road.

Cheers,
tpltnt

[codecov-io]

Codecov Report

Merging #410 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #410   +/-   ##
=======================================
  Coverage   88.02%   88.02%           
=======================================
  Files         146      146           
  Lines       27577    27577           
  Branches     3921     3921           
=======================================
  Hits        24276    24276           
- Misses       2594     2598    +4     
+ Partials      707      703    -4

Impacted Files	Coverage Δ
src/allmydata/web/status.py	83.27% <0%> (-0.12%)	⬇️
src/allmydata/util/encodingutil.py	87.95% <0%> (ø)	⬆️
src/allmydata/windows/fixups.py	0% <0%> (ø)	⬆️
src/allmydata/windows/inotify.py	0% <0%> (ø)	⬆️
src/allmydata/mutable/servermap.py	94.2% <0%> (+0.16%)	⬆️

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[warner]

looks good, landing (rebased) in bfae038