gssapi_krb5.c: Rearrange OID's so that the V1V2 mechanism set returns

gssapi_krb5.c: Rearrange OID's so that the V1V2 mechanism set returns
	all three mechanism ID's recognized by this implementation, with the
	RFC1964 OID first (and thus preferred).

import_sec_context.c (krb5_gss_convert_static_mech_oid): Make the old
	convert_static_oid() function globally accessible with a namespace
	compliant name, since init_sec_context() needs to be able to use this
	function.

indicate_mechs.c (krb5_gss_indicate_mechs): Return the v1v2 mechanism
	set OID, since we should return all the mechanisms that we support.

init_sec_context.c (krb5_gss_init_sec_context): Make ctx->mech_used
	use a static OID, since it is returned by gss_inquire_context which
	must return a static OID.

wrap_size_limit.c (krb5_gss_wrap_size_limit): Fix bug where we would
	overestimate the size of the allowable input message by one byte,
	because we weren't passing the right estimate of the wrapped data to
	g_token_size().

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@11315 dc483132-0cff-0310-8789-dd5450dbe970