Currently the documentation pretends to create a JKS keystore. It is
only actually a JKS keystore on java 8: on java9+ it is a PKCS12
keystore with a .jks extension (because PKCS12 is the new java default).
It works even though solr explicitly tells the JDK
(SOLR_SSL_KEY_STORE_TYPE=JKS) that its JKS when it is in fact not, due
to how keystore backwards compatibility was implemented.
Fix docs to explicitly create a PKCS12 keystore with .p12 extension and
so on instead of a PKCS12 keystore masquerading as a JKS one. This
simplifies the SSL steps since the "conversion" step (which was doing
nothing) from .JKS -> .P12 can be removed.
Jetty 9.4.16.v20190411 and up introduced separate
client and server SslContextFactory implementations.
This split requires the proper use of of
SslContextFactory in clients and server configs.
This fixes the following
* SSL with SOLR_SSL_NEED_CLIENT_AUTH not working since v8.2.0
* Http2SolrClient SSL not working in branch_8x
Signed-off-by: Kevin Risden <krisden@apache.org>