Expire the long term obsoleted VM flags

The following flags were deprecated and obsoleted (as indicated below) but their expiration was left open-ended:

  { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
  { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
  { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
  { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
  { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
  { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
  { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },

I believe sufficient time has passed that we can just expire these flags immediately (ie delete the above entries in the flag table).

The Java tool command reference (manpage) will also need updating to reflect the changes to documented obsolete flags.