don't use cache when pulling brand new version from pypi (#199)

Author: graebm

codebuild/cd/test_prod_pypi.yml

@@ -12,9 +12,9 @@ phases:
   build:
     commands:
       - echo Build started on `date`
-      - cd aws-crt-python 
+      - cd aws-crt-python
       - CURRENT_TAG_VERSION=$(git describe --tags | cut -f2 -dv)
-      - python3 -m pip install --user awscrt==$CURRENT_TAG_VERSION
+      - python3 -m pip install --no-cache-dir --user awscrt==$CURRENT_TAG_VERSION
       - python3 continuous-delivery/test-pip-install.py
   post_build:
     commands:

codebuild/cd/test_test_pypi.yml

@@ -12,9 +12,9 @@ phases:
   build:
     commands:
       - echo Build started on `date`
-      - cd aws-crt-python 
+      - cd aws-crt-python
       - CURRENT_TAG_VERSION=$(git describe --tags | cut -f2 -dv)
-      - python3 -m pip install -i https://testpypi.python.org/simple --user awscrt==$CURRENT_TAG_VERSION
+      - python3 -m pip install --no-cache-dir -i https://testpypi.python.org/simple --user awscrt==$CURRENT_TAG_VERSION
       - python3 continuous-delivery/test-pip-install.py
   post_build:
     commands:

continuous-delivery/wait-for-pypi.py

@@ -11,7 +11,8 @@
 def wait(package, version, index_url=DEFAULT_INDEX_URL, timeout=DEFAULT_TIMEOUT, interval=DEFAULT_INTERVAL):
     give_up_time = time.time() + timeout
     while True:
-        output = subprocess.check_output([sys.executable, '-m', 'pip', 'search', '--index', index_url, package])
+        output = subprocess.check_output([sys.executable, '-m', 'pip', 'search',
+                                          '--no-cache-dir', '--index', index_url, package])
         output = output.decode()
 
         # output looks like: 'awscrt (0.3.1)  - A common runtime for AWS Python projects\n...'