Add FIPS support

[yurem]

This update add support for RHEL 8.4 with DISA STIG Security Profile.
The code inside this PR updates SSL related parts to conform FIPS 140-2 Cryptography for SSL/TLS.

Before running setup we need to generate key in PKCS11 keystore.

keytool -genkey -alias server-cert -keyalg rsa -dname "CN=FQDN,O=OpenDJ RSA Self-Signed Certificate" -keystore NONE -storetype PKCS11 -storepass changeit
keytool -selfcert -alias server-cert -validity 3650 -keystore NONE -storetype PKCS11 -storepass changeit

After that we can run setup and specify usePkcs11Keystore=true

In order to run opendj commands we can specify additional parameters:

--trustStorePath /opt/opendj/config/admin-truststore --trustStorePasswordFile /opt/opendj/config/keystore.pin

[yurem]

This PR also contains fix for remove attribute method in ConfigureDS.java.

[halper]

Hey @yurem,

Thanks for doing a great job. I was wondering if you are planning to publish a document for configuring OpenDJ with FIPS support? And I assume the end user will be able to use FIPS support with the next version.

Cheers,
Alper