Fix powershellv2 

Powershell v2 (win7 vintage) doesn't have json cmdlets.

Got a report via chocolatey.org message that this doesn't work on win7. Cried. Replaced with simpler text file based approach for separating data from code.

Also fix package version fix notation bit of the automation to produce version numbers valid with chocolatey/nuspec.

I've already published a fixed 0.4.5-rc2 and 0.4.4 with this
* https://chocolatey.org/packages/bazel/0.4.4.20170306
* https://chocolatey.org/packages/bazel/0.4.5-rc2-20170306-124051

Closes #2633.

--
Reviewed-on: https://github.com/bazelbuild/bazel/pull/2633
PiperOrigin-RevId: 149314972
MOS_MIGRATED_REVID=149314972
diff --git a/scripts/packages/chocolatey/build.ps1 b/scripts/packages/chocolatey/build.ps1
index ae1d594..2b196d9 100644
--- a/scripts/packages/chocolatey/build.ps1
+++ b/scripts/packages/chocolatey/build.ps1
@@ -27,13 +27,17 @@
 }
 
 if ($fixPackage -eq $true) {
-  $tvPackageFixVersion = "-$((get-date).tostring("yyyyMMdd-hhmmss"))"
+  $prefix = "-"
+  if ($mode -eq "release") {
+    $prefix = "."
+  }
+  $tvPackageFixVersion = "$($prefix)$((get-date).tostring("yyyyMMdd"))"
 }
 rm -force -ErrorAction SilentlyContinue ./*.nupkg
 rm -force -ErrorAction SilentlyContinue ./bazel.nuspec
 rm -force -ErrorAction SilentlyContinue ./tools/LICENSE
-rm -force -ErrorAction SilentlyContinue ./tools/params.json
 rm -force -ErrorAction SilentlyContinue ./tools/*.orig
+rm -force -ErrorAction SilentlyContinue "./tools/params.*"
 if ($checksum -eq "") {
   rm -force -ErrorAction SilentlyContinue ./*.zip
 }
@@ -63,13 +67,10 @@
 add-content -value $licenseHeader -path "./tools/LICENSE"
 add-content -value (get-content "../../../LICENSE") -path "./tools/LICENSE"
 
-$params = @{
-  package = @{
-    uri = $tvUri;
-    checksum = $tvChecksum;
-    checksumType = "sha256";
-  }
-}
-add-content -value (ConvertTo-Json $params) -path "./tools/params.json"
+$params = @"
+$tvUri
+$tvChecksum
+"@
+add-content -value $params -path "./tools/params.txt"
 
 choco pack ./bazel.nuspec
diff --git a/scripts/packages/chocolatey/test.ps1 b/scripts/packages/chocolatey/test.ps1
index febbc2f..b561ba2 100644
--- a/scripts/packages/chocolatey/test.ps1
+++ b/scripts/packages/chocolatey/test.ps1
@@ -1,12 +1,13 @@
 param(
-  [switch] $prerelease
+  [switch] $prerelease,
+  [string] $sources = "."
 )
 
 choco uninstall bazel --force -y
 if ($prerelease) {
-  choco install bazel --verbose --debug --prerelease --force -y -s ".;https://chocolatey.org/api/v2/"
+  choco install bazel --verbose --debug --prerelease --force -y -s $sources
 } else {
-  choco install bazel --verbose --debug --force -y -s ".;https://chocolatey.org/api/v2/"
+  choco install bazel --verbose --debug --force -y -s $sources
 }
 
 if ($LASTEXITCODE -ne 0)
diff --git a/scripts/packages/chocolatey/tools/chocolateyinstall.ps1 b/scripts/packages/chocolatey/tools/chocolateyinstall.ps1
index fbd3cc3..2690150 100644
--- a/scripts/packages/chocolatey/tools/chocolateyinstall.ps1
+++ b/scripts/packages/chocolatey/tools/chocolateyinstall.ps1
@@ -2,22 +2,18 @@
 $packageName = 'bazel'
 
 $toolsDir = Split-Path -parent $MyInvocation.MyCommand.Definition
-$json = gc "$toolsDir\params.json"
-$p = (($json) -join "`n") | convertfrom-json
+$paramsText = get-content "$($toolsDir)\params.txt"
+$p = $paramsText.Split("`n")
 
 $packageDir = Split-Path -parent $toolsDir
-$binRoot = (Get-ToolsLocation) -replace "\\", "/"
 
-write-host "Read params from json"
-write-host (convertto-json $p)
+write-host "Read params from text file"
+write-host $p
 
 Install-ChocolateyZipPackage -PackageName "$packageName" `
-  -Url "$($p.package.uri)" `
-  -Checksum "$($p.package.checksum)" `
-  -ChecksumType "$($p.package.checksumType)" `
-  -Url64bit "$($p.package.uri)" `
-  -Checksum64 "$($p.package.checksum)" `
-  -Checksum64Type "$($p.package.checksumType)" `
+  -Url64bit "$($p[0])" `
+  -Checksum64 "$($p[1])" `
+  -Checksum64Type "sha256" `
   -UnzipLocation "$packageDir"
 
 write-host "Ensure that msys2 dll is present in PATH to allow bazel to be run from non-msys2 shells"