Fix typos in initialize-urandom.py & gerrit-git-prep.sh

TrivialFix

Change-Id: I77e9a4202ea7feb9b4ae682237345487ba57a241

jenkins/scripts/gerrit-git-prep.sh

@@ -53,7 +53,7 @@ if [ -z "$ZUUL_REF" ]; then
         # use the origin since zuul mergers have outdated branches
         ZUUL_URL=$GIT_ORIGIN
     else
-        echo "Provide either ZUUL_REF or BRANCH in the calling enviromnent."
+        echo "Provide either ZUUL_REF or BRANCH in the calling environment."
         exit 1
     fi
 fi

nodepool/elements/initialize-urandom/static/usr/local/bin/initialize-urandom.py

@@ -223,7 +223,7 @@ class Pump(object):
             r = self.getrandom(1, nonblock=True)
             if len(r) != 1:
                 raise Exception("No data returned from getrandom")
-            print("Nonblocking pool initilaized")
+            print("Nonblocking pool initialized")
             return True
         except GeneratorNotInitializedError:
             return False