sonar fix for server pool

- move to a method for nest try and catch
- fixed some typos in comments
- use constant for the same String
- boolean method should be checked
- removed unnecessary exceptions

Issue-ID: POLICY-2616
Change-Id: I647ee095171feedfd44ca6967676f61842c2c91b
Signed-off-by: Taka Cho <takamune.cho@att.com>
3 files changed