title: Import-AzKeyVaultCertificate with CAs doesn't work
body: <p>I have a .pem certificate with chain, signed by the external CA, generated from .csr created in KeyVault.
  I'm using
  <code>Import-AzKeyVaultCertificate -VaultName &quot;keyVaultName&quot; -Name &quot;Certificate&quot; -FilePath &quot;Certificate1.pem&quot;</code> to import my certificate, I can see it in my KeyVault. Unfortunately the certificate is imported without CAs.
  If I'll do exactly the same operation but instead of using <code>Import-AzKeyVaultCertificate</code> I will manually upload a certificate to KV using option <code>Merge Signed Request</code> this certificate contains desired CAs. Is there any way to do it using <code>Import-AzKeyVaultCertificate</code> or <code>az keyvault certificate import</code> to preserve CAs certificates?</p>