HUE-1981 [impala] Smoothen tab jumping

Fixed log scrolling
HUE-1975 [search] Add the dynamic fields from the Solr API

We now get all the standard fields (like before) + the
genric field instances from the index as list of possible fields.

Update the download icons
Add a test
Update the test mocks
HUE-1982 [impala] Column scrolling does not support aliases that are similar to the original column name

Needed to do an exact match on the contents of the TH cells.
[core] add ssl_cipher_list to hue.ini
HUE-1984 [hbase] url encode requests

URL encode on front end, then decode on backend.