qa/workunits: cephtool: split into properly indented functions

qa/workunits: cephtool: split into properly indented functions

The test was a big sequence of commands being run and it has been growing
organically for a while, even though it has maintained a sense of
locality with regard to the portions being tested.

This patch intends to split the commands into functions, allowing for a
better semantic context and easier expansion.  On the other hand, this
will also allow us to implement mechanisms to run specific portions of
the test instead of always having to run the whole thing just to test a
couple of lines down at the bottom (or have to creatively edit the test).

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>