[FAB-13332] Add cryptogen extend to integration tests
[FAB-13332] Add cryptogen extend to integration tests

This change set adds an ability to call "cryptogen extend"
in integration tests.

Change-Id: I5db2adbdb1260bf47da33ad1b5df9022a8fb1c95
Signed-off-by: yacovm <632344b5da9bd743456189af4db4b56472defb8c@il.ibm.com>

xixuejia/fabric,xixuejia/fabric,xixuejia/fabric