incorrect "commonFolder" values in two FPGA samples (#928)

* Delete Tools/IoTConnectionTools/analog-in directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/digital-in directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/digital-out directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/hello-iot-world directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/interrupt directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/onboard-blink directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/pwm directory

We are retiring the MRAA/UPM IoT samples.

* Delete Tools/IoTConnectionTools/up2-leds directory

We are retiring the MRAA/UPM IoT samples.

* Incorrect number of "../../.." relative references in the commonFolder
field for the FPGA "compute_units" and "pipe_array" samples.

This fixes a problem in the sample.json files for these two samples. These
mistakes cannot be found by the sample.json schema checker, so a check for
this condition was added to the sample aggregator's code. The new test
confirms that the files referenced by the commonFolder object do exist.

Author: xmnboy

Diff for: DirectProgramming/DPC++FPGA/Tutorials/DesignPatterns/compute_units/sample.json

@@ -9,7 +9,7 @@
   "builder": ["ide", "cmake"],
   "languages": [{"cpp":{}}],
   "commonFolder": {
-    "base": "../..",
+    "base": "../../..",
     "include": [
       "Tutorials/DesignPatterns/compute_units",
       "include/pipe_utils.hpp"

Diff for: DirectProgramming/DPC++FPGA/Tutorials/DesignPatterns/pipe_array/sample.json

@@ -9,7 +9,7 @@
   "builder": ["ide", "cmake"],
   "languages": [{"cpp":{}}],
   "commonFolder": {
-    "base": "../..",
+    "base": "../../..",
     "include": [
       "Tutorials/DesignPatterns/pipe_array",
       "include/pipe_utils.hpp"