* k5seal.c (kg_seal): Extract the krb5 context from the security context

* k5seal.c (kg_seal): Extract the krb5 context from the security context
instead of requiring it be passed in as an argument.
* k5unseal.c (kg_unseal): Likewise.
* gssapiP_krb5.h (kg_seal, kg_unseal): Declarations updated.
* delete_sec_context.c, process_context_token.c, seal.c, sign.c, unseal.c,
verify.c: Callers changed.
* inq_context.c (krb5_gss_inquire_context): Use krb5 context contained in
security context instead of calling kg_get_context.
* wrap_size_limit.c (krb5_gss_wrap_size_limit): Likewise.

* import_sec_context.c (krb5_gss_ser_init): New function.
(krb5_gss_import_sec_context): Create a krb5 context locally to use for the
import.
* export_sec_context.c (krb5_gss_export_sec_context): Use the krb5 context in
the security context.
* gssapiP_krb5.h (krb5_gss_ser_init): Declare.
* gssapi_krb5.c (kg_get_context): Don't call krb5 serialization initialization
code here.

* accept_sec_context.c (krb5_gss_accept_sec_context): Free the new krb5 context
in an error case not caught before.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@16171 dc483132-0cff-0310-8789-dd5450dbe970