Fix formatting of the liquibase changelog that creates table

[murdos]

Before:

<!--
        Added the entity XYZ.
    -->
    <changeSet id="20190121114007-1" author="jhipster">
        <createTable tableName="xyz" remarks="abc">
            <column name="id" type="bigint" autoIncrement="${autoIncrement}">
                <constraints primaryKey="true" nullable="false"/>
            </column>
            <column name="code" type="varchar(255)">
                <constraints nullable="false" />
            </column>

            <column name="name" type="varchar(255)">
                <constraints nullable="true" />
            </column>
            <column name="other_table_id" type="bigint">
                <constraints unique="true" nullable="true" uniqueConstraintName="ux_xyz_other_table_id" />
            </column>            <column name="another_table_id" type="bigint">
                <constraints unique="true" nullable="true" uniqueConstraintName="ux_xyz_another_table_id" />
            </column>
            <column name="third_one_id" type="bigint">
                <constraints nullable="false" />
            </column>

            <!-- jhipster-needle-liquibase-add-column - JHipster will add columns here, do not remove-->
        </createTable>

    </changeSet>

After:

<!--
        Added the entity XYZ.
    -->
    <changeSet id="20190121114007-1" author="jhipster">
        <createTable tableName="xyz" remarks="abc">
            <column name="id" type="bigint" autoIncrement="${autoIncrement}">
                <constraints primaryKey="true" nullable="false"/>
            </column>
            <column name="code" type="varchar(255)">
                <constraints nullable="false" />
            </column>
            </column>
            <column name="name" type="varchar(255)">
                <constraints nullable="true" />
            </column>
            <column name="other_table_id" type="bigint">
                <constraints unique="true" nullable="true" uniqueConstraintName="ux_xyz_other_table_id" />
            </column>
            <column name="another_table_id" type="bigint">
                <constraints unique="true" nullable="true" uniqueConstraintName="ux_xyz_another_table_id" />
            </column>
            <column name="third_one_id" type="bigint">
                <constraints nullable="false" />
            </column>
            <!-- jhipster-needle-liquibase-add-column - JHipster will add columns here, do not remove-->
        </createTable>
    </changeSet>

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• Tests are added where necessary
• Documentation is added/updated where necessary
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