Add some features

[vishesh92]

This PR adds the following features:

1. Allow benchmark of resources during teardown
2. Add pagination while listing resources (Fixes Get all resources instead of being limited by pagesize in config #3)
3. Implement vmaction in config which allows to set the state of VMs while creating VMs
4. Allow networks to be configurable

Output

For csbench -teardown -domain -vm -volume -network

+----------------------+-------+--------+--------+--------+--------+-----------------+-----------------+-----------------+
| TYPE                 | COUNT |    MIN |    MAX |    AVG | MEDIAN | 90TH PERCENTILE | 95TH PERCENTILE | 99TH PERCENTILE |
+----------------------+-------+--------+--------+--------+--------+-----------------+-----------------+-----------------+
| network-delete - All |     5 |  3.191 |  3.201 |  3.199 |  3.201 |           3.201 |           3.201 |           3.201 |
| domain-delete - All  |     5 |  1.127 |  3.234 |  1.987 |  1.187 |           3.233 |           3.233 |           3.233 |
| vm-destroy - All     |    10 | 10.255 | 10.429 | 10.369 |  10.39 |          10.418 |          10.424 |          10.424 |
| volume-delete - All  |    20 |   1.17 |  1.257 |  1.211 |  1.211 |           1.233 |           1.244 |           1.251 |
+----------------------+-------+--------+--------+--------+--------+-----------------+-----------------+-----------------+

For csbench -vmaction=random

+----------------------+-------+-------+-------+-------+--------+-----------------+-----------------+-----------------+
| TYPE                 | COUNT |   MIN |   MAX |   AVG | MEDIAN | 90TH PERCENTILE | 95TH PERCENTILE | 99TH PERCENTILE |
+----------------------+-------+-------+-------+-------+--------+-----------------+-----------------+-----------------+
| vmaction-stop - All  |     5 | 3.185 | 3.263 | 3.235 |  3.235 |           3.263 |           3.263 |           3.263 |
| vmaction-start - All |     2 | 3.258 | 3.262 |  3.26 |   3.26 |            3.26 |            3.26 |            3.26 |
+----------------------+-------+-------+-------+-------+--------+-----------------+-----------------+-----------------+

[yadvr]

Should these be left blank?

[vishesh92]

Added these in the config as a sample. Reverted the change for now.

[yadvr]

On a really high level LGTM - left one remark on documentation.

Rest I request one of @harikrishna-patnala @shwstppr to help with a short review iteration and then with @borisstoyanov @vladimirpetrov to schedule QA of this, as well as review the requirements fully before passing to me for IR.

[harikrishna-patnala]

Code LGTM.

@vishesh92 will you be able to add some test results in the PR description, as it helps in reviewing in general.

[harikrishna-patnala]

Merged this based on test results and approvals.