Changes

testenv/README: fix markdown syntax

Put the two wget lines into a code block, otherwise the line break is
omitted and it looks weird.

Change-Id: Ia61d56cdf4822595e2a05b320e387a079bdbfeb2

HTTP_Adapter: allow requests to different hosts

The host that is requested via the HTTP_Adapter is configured once on
initialization. This is fine if the test scenario only has exactly one
destination to query. For multiple destinations, this model does not
work. Let's add an http_pars parameter to the request functions, so
that the user can direct the requests to different hosts dynamically.

Related: SYS#7339
Change-Id: Ic87674f2381b3c6a1be6d0ce28a9e5403cda201b

HTTP_Adapter: add missing omit qualifiers

On some function in the HTTP_Adapter module, the (omit)
qualifiers are missing.

Related: SYS#7339
Change-Id: I985021852cbe2bcce60b1466e8ec9c3820a0c0f8