Fix Yamato jobs to fail in case of a build or test error!

The issue is that the logs are piped using `tee` to create a clean log file
See for instance:

   perl build.pl | tee linux_build.txt

That's the wrong idea in the first place, the logs in Yamato have colors, are searchable etc.

I initially provided a complex solution
(Using Bash set -o pipefail to fail the whole pipeline if the first command file, and PowerShell $LASTEXITCODE to fail in case of an error)
but I believe the simplicity here should be the key

Author: SRombautsU

.yamato/linux-build.yml

@@ -5,15 +5,13 @@ agent:
   flavor: b1.large
 
 commands:
+  # Build PerforcePlugin and TestServer
+  - perl build.pl
+  # Run the tests (requires Perforce P4 CLI)
   - hg clone --config extensions.largefiles= http://hg-mirror-slo.hq.unity3d.com/unity-extra/perforce PerforceBinaries
-  - perl build.pl | tee linux_build.txt
-  - perl build.pl -test | tee linux_test.txt
+  - perl build.pl -test
 
 artifacts:
   builds:
     paths:
       - "Build/linux64/PerforcePlugin"
-  logs:
-    paths:
-      - "linux_build.txt"
-      - "linux_test.txt"

.yamato/osx-build.yml

@@ -5,15 +5,13 @@ agent:
   flavor: b1.large
 
 commands:
+  # Build PerforcePlugin and TestServer
+  - perl build.pl
+  # Run the tests (requires Perforce P4 CLI)
   - hg clone --config extensions.largefiles= http://hg-mirror-slo.hq.unity3d.com/unity-extra/perforce PerforceBinaries
-  - perl build.pl | tee mac_build.txt
-  - perl build.pl -test | tee mac_test.txt
+  - perl build.pl -test
 
 artifacts:
   builds:
     paths:
       - "Build/OSXx64/PerforcePlugin"
-  logs:
-    paths:
-      - "mac_build.txt"
-      - "mac_test.txt"

.yamato/windows-build.yml

@@ -6,16 +6,14 @@ agent:
 
 interpreter: powershell
 commands:
-  - perl build.pl | tee win_build.txt
+  # Build PerforcePlugin and TestServer
+  - perl build.pl
+  # Run the tests (requires Perforce P4 CLI)
   - hg clone --config extensions.largefiles= http://hg-mirror-slo.hq.unity3d.com/unity-extra/perforce PerforceBinaries
-  - perl build.pl -test | tee win_test.txt
+  - perl build.pl -test
 
 artifacts:
   builds:
     paths:
       - "Build/Win32/PerforcePlugin.exe"
       - "Build/Win32/PerforcePlugin.pdb"
-  logs:
-    paths:
-      - "win_build.txt"
-      - "win_test.txt"