r10286: This patch is ugly and disgusting, but for now it works better than the other

r10286: This patch is ugly and disgusting, but for now it works better than the other
ideas I have had.

When I get a full list of things I want to do to a krb5_context I'll
either add gsskrb5_ wrappers, or a way of speicfying the krb5 context
per gssapi context.

(I want to ensure that the only krb5_context variables created while
executing Samba4 are via our wrapper).

Andrew Bartlett
(This used to be commit 8a22d46e70e9f863831aba0c9913d195f833d625)