cosmetic: vty prompts: add space after '#'
cosmetic: vty prompts: add space after '#'

Typically, our VTY prompts have space after the '#', but some of the osmo-bts
VTY prompts don't:

  OsmoBTS# configure terminal
  OsmoBTS(config)# bts 0
  OsmoBTS(bts)#gsmtap-sapi ccch

Add spaces after the '#' to yield e.g.

  OsmoBTS(bts)# gsmtap-sapi ccch

Change-Id: If0591a359e77f01abb76c4113181af7a7733ddd4

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts