server: Add get_token_impersonation_level server call for retrieving the impersonation level from a token.

[Robert Shearman]

Add tests for GetTokenInformation(TokenImpersonationLevel).
---
  dlls/advapi32/tests/security.c |   24 ++++++++++++++++++++----
  dlls/ntdll/nt.c                |   15 ++++++++++++++-
  server/protocol.def            |    7 +++++++
  server/token.c                 |   17 +++++++++++++++++
  4 files changed, 58 insertions(+), 5 deletions(-)

tools/make_requests needs to be run after applying this patch.
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