[FIX] utm: use tracking_fields from utm.mixin and not from the current model

This function cannot be overridden in a model which inherit utm.mixin
Limitation by the heritage on AbstractModel

record_crm_lead.tracking_fields() will call tracking_fields() from module
utm.mixin (if not overridden on crm.lead) instead of the overridden method
from utm.mixin.

To force the call of overridden method, we use
self.pool['utm.mixin'].tracking_fields() which respects overridden
methods of utm.mixin, but will ignore overridden method on crm.lead

Eg:

 class utm_mixin(osv.AbstractModel):
    _name = 'utm.mixin'

    def tracking_fields(self):
        return "A"

 class utm_mixin_overridden(osv.AbstractModel):
    _inherit = 'utm.mixin'

    def tracking_fields(self):
        return "B"

 class crm_lead(osv.osv):
    _name = "crm.lead"
    _inherit = ['utm.mixin']

    def func_1(self):
        print self.tracking_fields()
        # print "A"

    def func_2(self):
        print self.pool['utm.mixin'].tracking_fields()
        # print "B"

It's the dispatch method of ir_http which save GET parameters in cookies,
ignoring the overridden tracking_fields method in inherited model.

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