refresh bgp routes with import table enabled

[Alexander Zubkov]

Hi,

When import table is enabled for bgp, "reload in" uses the table and
one cannot force refresh from the peer. I suggest to add refresh
functions to reload routes on a protocol level, and "reload receive"
command to call them. I used "reload receive" not to add additional
keywords and it seems descriptive too. Pathches are attached.
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