Add Python location to ‘az —version’

[derekbekoe]

Example:

$ az --version
azure-cli (2.0.3+dev)

acr (2.0.1+dev)
acs (2.0.3+dev)
appservice (0.1.3+dev)
batch (2.0.1+dev)
cloud (2.0.1+dev)
component (2.0.1+dev)
configure (2.0.3+dev)
container (0.1.3+dev)
core (2.0.3+dev)
dla (0.0.2+dev)
dls (0.0.2+dev)
documentdb (0.1.3+dev)
feedback (2.0.1+dev)
find (0.0.2+dev)
iot (0.1.3+dev)
keyvault (2.0.1+dev)
lab (0.0.2+dev)
monitor (0.0.2+dev)
network (2.0.3+dev)
nspkg (2.0.0+dev)
profile (2.0.3+dev)
redis (0.2.0+dev)
resource (2.0.3+dev)
role (2.0.2+dev)
sql (2.0.1+dev)
storage (2.0.3+dev)
taskhelp (0.1.1b4+dev)
testsdk (0.1.0+dev)
utility-automation (0.1.1)
vm (2.0.3+dev)

Python (Darwin) 3.5.1 (v3.5.1:37a07cee5969, Dec  5 2015, 21:12:44) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]

Python location /Users/debekoe/Repos/derekbekoe-azure-cli/env/bin/python

[codecov-io]

Codecov Report

Merging #2986 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2986      +/-   ##
==========================================
- Coverage    63.4%   63.39%   -0.01%     
==========================================
  Files         466      466              
  Lines       26593    26596       +3     
  Branches     4083     4083              
==========================================
  Hits        16861    16861              
+ Misses       8655     8618      -37     
- Partials     1077     1117      +40

Impacted Files	Coverage Δ
src/azure-cli-core/azure/cli/core/util.py	67.42% <0%> (-1.57%)	⬇️
...re-cli-vm/azure/cli/command_modules/vm/commands.py	89.53% <0%> (ø)	⬆️
...onitor/azure/cli/command_modules/monitor/custom.py	67.27% <0%> (ø)	⬆️
...e-cli-iot/azure/cli/command_modules/iot/_params.py	95.74% <0%> (ø)	⬆️
...i-cloud/azure/cli/command_modules/cloud/_params.py	93.33% <0%> (ø)	⬆️
...-testsdk/azure/cli/testsdk/recording_processors.py	53.33% <0%> (ø)	⬆️
...twork/azure/cli/command_modules/network/_format.py	43.37% <0%> (ø)	⬆️
...twork/azure/cli/command_modules/network/_params.py	93.11% <0%> (ø)	⬆️
...rce/azure/cli/command_modules/resource/commands.py	83.11% <0%> (ø)	⬆️
...li-lab/azure/cli/command_modules/lab/validators.py	29.52% <0%> (ø)	⬆️
... and 14 more

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