[9] request for review 8059009: LDAPCertStore fails to retrieve CRL after LDAP server closes idle connection

[Artem Smotrakov]

Please review this fix for 9.

It corrects the following issues:
- InitialLdapContext and LDAPCertStore does not recover connection if it 
was closed, for example, by server, or due to some network issue
- A cache of CertStore instances in LDAPCertStore does not work if 
LDAPCertStoreParameters is used

Changes:
- updated LdapCtx to make re-connect possible
- updated LDAPCertStore to use InitialLdapContext that supports re-connect
- updated LDAPCertStore to use only SunLDAPCertStoreParameters objects 
for cache of CertStore instances

Bug: https://bugs.openjdk.java.net/browse/JDK-8059009
Webrev: http://cr.openjdk.java.net/~asmotrak/8059009/webrev.01/

Artem