BE-645 Update insecure python packages

- Also update error message for assertion in e2e test

Change-Id: I4c0119b2717097e51dfd5a0cc9196244f55a2293
Signed-off-by: Atsushi Neki <atsushin@fast.au.fujitsu.com>

app/platform/fabric/e2e-test/explorer.feature

@@ -144,7 +144,7 @@ Scenario: [balance-transfer] Register a new user successfully
     Then the response status code should equal 200
     Then the response structure should equal "registerResp"
     Then the response parameter "status" should equal 400
-    Then the response parameter "message" should equal "failed to register with Error: Username already exist"
+    Then the response parameter "message" should equal "Error: already exists"
 
 @basic
 # @doNotDecompose
@@ -175,7 +175,7 @@ Scenario: [first-network] Not supported to register a new user
     Then the response status code should equal 200
     Then the response structure should equal "registerResp"
     Then the response parameter "status" should equal 400
-    Then the response parameter "message" should equal "failed to register with Error: Not supported user registration without CA"
+    Then the response parameter "message" should equal "Error: did not register with CA"
 
 @bugfix
 # @doNotDecompose

app/platform/fabric/e2e-test/requirement.txt

@@ -3,14 +3,14 @@
 #
 behave
 nose
-flask==0.10.1
+flask==1.0.3
 python-dateutil==2.2
 pytz==2014.3
-pyyaml==3.10
+pyyaml==5.1
 couchdb==1.0
 flask-cors==2.0.1
 requests
-pyOpenSSL==16.2.0
+pyOpenSSL==19.0.0
 pysha3==1.0b1
 six
 grpcio==0.13.1
@@ -24,4 +24,4 @@ pyexecjs
 cython
 psutil
 assertpy
-behave_rest
+behave_rest