Add PostgreSQL 10 as a supported platform for Jira

JIRA-Bootstrap INFO [c.a.jira.startup.JiraStartupLogger] JIRA pre-database startup checks completed successfully.
JIRA-Bootstrap INFO [o.o.c.entity.jdbc.DatabaseUtil] Database Product Name is PostgreSQL
JIRA-Bootstrap INFO [o.o.c.entity.jdbc.DatabaseUtil] Database Product Version is 10beta3
JIRA-Bootstrap INFO [o.o.c.entity.jdbc.DatabaseUtil] Database Driver Name is PostgreSQL Native Driver
JIRA-Bootstrap INFO [o.o.c.entity.jdbc.DatabaseUtil] Database Driver Version is PostgreSQL 9.1 JDBC4 (build 903)
JIRA-Bootstrap WARN [o.o.c.entity.jdbc.DatabaseUtil] Entity "Action" has no table in the database
JIRA-Bootstrap ERROR [o.o.c.entity.jdbc.DatabaseUtil] Could not create table "public.jiraaction"
JIRA-Bootstrap ERROR [o.o.c.entity.jdbc.DatabaseUtil] SQL Exception while executing the following:
CREATE TABLE public.jiraaction (ID NUMERIC(18,0) NOT NULL, issueid NUMERIC(18,0), AUTHOR VARCHAR(255), actiontype VARCHAR(255), actionlevel VARCHAR(255), rolelevel NUMERIC(18,0), actionbody TEXT, CREATED TIMESTAMPTZ, UPDATEAUTHOR VARCHAR(255), UPDATED TIMESTAMPTZ, actionnum NUMERIC(18,0), CONSTRAINT PK_jiraaction PRIMARY KEY (ID))
Error was: org.postgresql.util.PSQLException: ERROR: relation "jiraaction" already exists
JIRA-Bootstrap WARN [o.o.c.entity.jdbc.DatabaseUtil] Entity "Application" has no table in the database
JIRA-Bootstrap ERROR [o.o.c.entity.jdbc.DatabaseUtil] Could not create table "public.cwd_application"
JIRA-Bootstrap ERROR [o.o.c.entity.jdbc.DatabaseUtil] SQL Exception while executing the following:
CREATE TABLE public.cwd_application (ID NUMERIC(18,0) NOT NULL, application_name VARCHAR(255), lower_application_name VARCHAR(255), created_date TIMESTAMPTZ, updated_date TIMESTAMPTZ, active NUMERIC(9,0), description VARCHAR(255), application_type VARCHAR(255), credential VARCHAR(255), CONSTRAINT PK_cwd_application PRIMARY KEY (ID))
Error was: org.postgresql.util.PSQLException: ERROR: relation "cwd_application" already exists
JIRA-Bootstrap WARN [o.o.c.entity.jdbc.DatabaseUtil] Entity "ApplicationUser" has no table in the database
JIRA-Bootstrap ERROR [o.o.c.entity.jdbc.DatabaseUtil] Could not create table "public.app_user"
JIRA-Bootstrap ERROR [o.o.c.entity.jdbc.DatabaseUtil] SQL Exception while executing the following: