Speed up tests (#153)

* Improve openssh_* tests.

* Use 2048 instead of 4096 bit keys in many places.

ci_complete

* Parameterize default RSA key length for tests.

* Reduce default RSA key size to 1024.

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* Fix error.

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* Use variable more often.

* Use 2048 bits for RSA keys for certificates on RHEL8 and CentOS8.

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* Fix missing constant.

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* Print default key sizes.

tests/integration/targets/openssl_privatekey_info/tasks/main.yml

@@ -12,13 +12,14 @@
   openssl_privatekey:
     path: '{{ output_dir }}/privatekey_2.pem'
     type: RSA
-    size: 2048
+    size: '{{ default_rsa_key_size }}'
 
 - name: Generate privatekey 3 (with password)
   openssl_privatekey:
     path: '{{ output_dir }}/privatekey_3.pem'
     passphrase: hunter2
     cipher: auto
+    size: '{{ default_rsa_key_size }}'
     select_crypto_backend: cryptography
 
 - name: Generate privatekey 4 (ECC)