This addresses GH-5165 and adds the ability to check if a lvol exists.
The tests for this don't fit nicely into the current integration tests so they are below.
```
---
- name: remove any existing lv=one of vg=main
lvol: lv=one vg=main state=absent
- name: remove any existing lv=two of vg=main
lvol: lv=two vg=main state=absent
- name: check to see if lv=one of vg=main exists
lvol: lv=one vg=main state=present
ignore_errors: true
register: lvol_result0
- name: Assert that we will get a "No size given."
assert:
that:
- "'No size given.' in lvol_result0.msg"
- name: create lv=one of vg=main sized 30g
lvol: lv=one size=30g vg=main state=present
register: lvol_result1
- name: Assert that we made changes."
assert:
that:
- "lvol_result1.changed == True"
- name: check to see if lv=one of vg=main exists
lvol: lv=one vg=main state=present
register: lvol_result2
- name: Assert that we did not make changes."
assert:
that:
- "lvol_result2.changed == False"
- name: remove lv=one of vg=main
lvol: lv=one vg=main state=absent
- name: create lv=two of vg=main sized 30G
lvol: lv=two size=30G vg=main state=present
register: lvol_result3
- name: Assert that we made changes."
assert:
that:
- "lvol_result3.changed == True"
- name: reduce lv=two of vg=main to 15G
lvol: lv=two size=15G vg=main state=present
register: lvol_result4
- name: Assert that we made changes."
assert:
that:
- "lvol_result4.changed == True"
- name: increase lv=two of vg=main to 30G
lvol: lv=two size=30G vg=main state=present
register: lvol_result5
- name: Assert that we made changes."
assert:
that:
- "lvol_result5.changed == True"
- name: create lv=two of vg=main sized 30G when already exists at 30G
lvol: lv=two size=30g vg=main state=present
register: lvol_result6
- name: Assert that we did not make changes."
assert:
that:
- "lvol_result6.changed == False"
- name: remove lv=two of vg=main
lvol: lv=two vg=main state=absent
```
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