Update test cert generation scripts to use SHA-256 by default

net/data/ssl/scripts/aia-test.cnf

 CA_DIR=out
 CA_NAME=aia-test-root
 AIA_URL=http://aia-test.invalid
 
 [ca]
 default_ca = CA_root
 preserve   = yes
 
 [CA_root]
 dir           = ${ENV::CA_DIR}
 key_size      = 2048
-algo          = sha1
+algo          = sha256
 database      = $dir/${ENV::CA_NAME}-index.txt
 new_certs_dir = $dir
 serial        = $dir/${ENV::CA_NAME}-serial
 certificate   = $dir/${ENV::CA_NAME}.pem
 private_key   = $dir/${ENV::CA_NAME}.key
 RANDFILE      = $dir/.rand
 default_days     = 3650
 default_crl_days = 30
-default_md       = sha1
+default_md       = sha256
 policy           = policy_anything
 unique_subject   = no
 copy_extensions  = copy
 
 [user_cert]
 basicConstraints       = critical, CA:false
 extendedKeyUsage       = serverAuth, clientAuth
 authorityInfoAccess    = caIssuers;URI:${ENV::AIA_URL}
 
 [ca_cert]
 basicConstraints       = critical, CA:true
 keyUsage               = critical, keyCertSign, cRLSign
 
 [policy_anything]
 # Default signing policy
 countryName            = optional
 stateOrProvinceName    = optional
 localityName           = optional
 organizationName       = optional
 organizationalUnitName = optional
 commonName             = optional
 emailAddress           = optional
 
 [req]
 default_bits       = 2048
-default_md         = sha1
+default_md         = sha256
 string_mask        = utf8only
 prompt             = no
 encrypt_key        = no
 distinguished_name = req_env_dn
 
 [req_env_dn]
 CN = ${ENV::CA_COMMON_NAME}