Fix spec tests for class pki

[lbetz]

expected that the catalogue would contain Exec[create-icinga2-ca] with command set to "/usr/local/sbin/icinga2 pki new-ca" but it is set to ""/usr/local/sbin/icinga2" pki new-ca"

expected that the catalogue would contain Exec[icinga2 pki create certificate signing request] with command set to "/usr/local/sbin/icinga2 pki new-cert --cn host.example.org --key /var/lib/icinga2/certs/host.example.org.key --csr /var/lib/icinga2/certs/host.example.org.csr" but it is set to ""/usr/local/sbin/icinga2" pki new-cert --cn host.example.org --key /var/lib/icinga2/certs/host.example.org.key --csr /var/lib/icinga2/certs/host.example.org.csr"

expected that the catalogue would contain Exec[icinga2 pki sign certificate] with command set to "/usr/local/sbin/icinga2 pki sign-csr --csr /var/lib/icinga2/certs/host.example.org.csr --cert /var/lib/icinga2/certs/host.example.org.crt" but it is set to ""/usr/local/sbin/icinga2" pki sign-csr --csr /var/lib/icinga2/certs/host.example.org.csr --cert /var/lib/icinga2/certs/host.example.org.crt"

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