dskeymgr sub-commands should not use argument groups

Usage:  dskeymgr  {options} export-ca-cert {options}

Exports the CA certificate associated with a deployment key to a keystore or as
a PEM file

Global Options:
    See "dskeymgr --help"

SubCommand Options:
-a, --alias {alias}
    The CA certificate alias, must not already exist in the keystore
    Default value: ca-cert
-f, --outputFile {outputFile}
    Optional path to a file where the CA certificate will be written in the PEM
    format, overwriting the file if it exists
-j, --deploymentKeyPasswordFile {deploymentKeyPasswordFile}
    Path to a file containing the deployment key password
-k, --deploymentKey {deploymentKey}
    The deployment key
-K, --keyStoreFile {keyStoreFile}
    Path to an existing PKCS12 keystore file or a path indicating where a new
    keystore file should be created
-w, --deploymentKeyPassword {deploymentKeyPassword}
    The deployment key password

LDAP connection options:
-u, --keyStorePasswordFile {keyStorePasswordFile}
    Path to a file containing the keystore password
-W, --keyStorePassword {keyStorePassword}
    Keystore cleartext password