SPEC file: visual aid for conditionals by means of indentation

This change may help to quickly read the conditionals.  It's
already been applied on Fedora packages, so let's sync it here.

Also added here is some small comment section changes (mostly
capitalization), again to sync with downstream.

CC: Lukáš Doktor <ldoktor@redhat.com>
Signed-off-by: NCleber Rosa <crosa@redhat.com>

python-avocado.spec

@@ -2,27 +2,27 @@
 
 # Conditional for release vs. snapshot builds. Set to 1 for release build.
 %if ! 0%{?rel_build:1}
-%global rel_build 1
+    %global rel_build 1
 %endif
 
 # Settings used for build from snapshots.
 %if 0%{?rel_build}
-%global gittar		%{srcname}-%{version}.tar.gz
+    %global gittar		%{srcname}-%{version}.tar.gz
 %else
-%if ! 0%{?commit:1}
-%global commit		0baf8a1665941d3e8eec88e56cda414e9d937970
-%endif
-%if ! 0%{?commit_date:1}
-%global commit_date	20170425
-%endif
-%global shortcommit	%(c=%{commit};echo ${c:0:7})
-%global gitrel		.%{commit_date}git%{shortcommit}
-%global gittar		%{srcname}-%{shortcommit}.tar.gz
+    %if ! 0%{?commit:1}
+        %global commit		b45e2c532001187e23cef61212fdc8fe44425a2a
+    %endif
+    %if ! 0%{?commit_date:1}
+        %global commit_date	20170518
+    %endif
+    %global shortcommit	%(c=%{commit};echo ${c:0:7})
+    %global gitrel		.%{commit_date}git%{shortcommit}
+    %global gittar		%{srcname}-%{shortcommit}.tar.gz
 %endif
 
-# selftests are provided but may need to skipped because many of
-# functional tests are time and resource sensitive and can
-# cause race conditions and random build failures.  they are
+# Selftests are provided but may need to be skipped because many of
+# the functional tests are time and resource sensitive and can
+# cause race conditions and random build failures. They are
 # enabled by default.
 %global with_tests 1