[lib] Merging functions to make generic library.

At present there are 2 different functions for prerequisites
and create session merging them and adding checks to make the
functions more effective when called from a conftest.py file.
By doing so we also avoid the possibility of running the same
function twice which might lead to problems.
For example when commands like:
$ gluster system:: execute gsec_create
it would make 2 entries in authorized keys files leading
to workers getting into faulty state.

Note:
This patch should only be merged after
merging the below mentioned patches:
[1] https://review.gluster.org/#/c/glusto-tests/+/23291/
[2] https://review.gluster.org/#/c/glusto-tests/+/23293/

Change-Id: I3f8cda7b589c86de4dab8c66d033b364dd495b9b
Signed-off-by: kshithijiyer <kshithij.ki@gmail.com>

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