getcert command shows an error: ca-error: Invalid cookie: u''

Issue

• getcert list command show an error similar to below

  Request ID '20181223123828':
          status: MONITORING
          ca-error: Invalid cookie: u''
          stuck: no
          key pair storage: type=FILE,location='/var/lib/ipa/ra-agent.key'
          certificate: type=FILE,location='/var/lib/ipa/ra-agent.pem'
          CA: dogtag-ipa-ca-renew-agent
          issuer: CN=Certificate Authority,O=EXAMPLE.COM
          subject: CN=IPA RA,O=EXAMPLE.COM
          expires: 2020-01-14 05:49:55 UTC
          key usage: digitalSignature,nonRepudiation,keyEncipherment,dataEncipherment
          eku: id-kp-serverAuth,id-kp-clientAuth
          pre-save command: /usr/libexec/ipa/certmonger/renew_ra_cert_pre
          post-save command: /usr/libexec/ipa/certmonger/renew_ra_cert
          track: yes
          auto-renew: yes
  

• ipa commands that involves dealing with certificates fail. For example, ipa host-del:

  # ipa host-del client.example.com
  ipa: ERROR: Certificate operation cannot be completed: EXCEPTION (Invalid Credential.)