Jochen Friedrich 83977c5754 Add parameters needed for PKI usage.
To use PKI with nrpe, a CA must be specified and anonymous DH must be disabled.
If client certificates are enforced by nrped, additionally a private cert and key
must be specified. This patch adds all these parameters as well TLS configuration
options to limit the TLS version and crypto parameters:

nrpe_ca          - The CA file to use for PKI. Defaults to none.
nrpe_cert        - The client cert file to use for PKI. Defaults to none.
nrpe_key         - The client key file to use for PKI. Defaults to none.
nrpe_ssl_version - The SSL/TLS version to use. Defaults to TLSv1+.
nrpe_cipher_list - The list of SSL ciphers to use. Default depends on check_nrpe version.
nrpe_dh_opt      - Anonymous Diffie Hellman use: 0 = deny, 1 = allow, 2 = force.
                   Default depends on check_nrpe version.
2020-03-16 13:49:57 +01:00
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