Update checkstyle rules to exclude methods

Checkstyle rules updated to:
1) allow getters and setters not to have javadoc
2) allow methods with less than 2 lines to not have javadoc
3) allow protected and private methods not to have javadoc
4) allow methods with names beginning with test|before|after not to have
javaodc

Issue-ID: INT-1395
Change-Id: I570cd90034c7b20d45a7e5a6ecacacdef80876a1
Signed-off-by: liamfallon <liam.fallon@est.tech>