Some small CLI changes

[Alexander V. Chernikov]

Hello list!

Two small additions:

1) Type filter can be specified in 'show symbols' command, like:
'show symbols table'

2) lsa database can be filtered by adv-router ID, like:
'show ospf lsadb advrouter 1.2.3.4'

P.S.

switch {} in show symbols is added in hope that a bit more info will be 
added when printing other data (it prints table type in "mpls/reflector" 
version, for example)


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